The stars - and Boomer - cheer on Golden boy Phelps: Matthew McConaughey and Camila Alves watch the Olympian take his 22nd gold... but Lochte's model girlfriend looks glum as he comes fifth 

Having attended a slew of Rio events, Matthew McConaughey is making something of a name for himself as Team USA's biggest and most famous Olympic superfan.  

And Thursday night was no different for the Dallas Buyers Club star as he and wife Camila Alves headed to the Aquatic Centre to cheer on U.S. swimmer Michael Phelps as he won his 22nd gold medal in the 200 metre medley.

The glamorous pair shouted themselves hoarse before sharing a celebratory smooch after the American record breaker's latest triumph. 

Come on! Matthew McConaughey and wife Camila Alves shouted themselves hoarse on Thursday night while cheering for Michael Phelps in Rio

Brining out the romance: The actor and his model wife shared a celebratory smooch in the stands after Phelps's triumph

Immersed in the action: The couple looked to be enjoying every moment of their Olympic experience in Brazil 

Famous fans: The Oscar-winning star and his wife have been spotted at a variety of Olympic events of late 

He's done it! The stars cheering efforts were not in vain as Phelps scored his 22nd Olympic gold medal

Dissapointing result: Kayla Rae Reid looks glum as boyfriend Ryan Lochte fails to medal in the event for the first time since his Olympic career began

Cheering on her man: Playboy model Kayla Rae Reid supports her boyfriend Ryan Lochte's in the 200 metre medley

Ryan Lochte was cheered on by his new Playboy model girlfriend Kayla Rae Reid, who was spotted in the stands sporting Lochte-themed glasses before watching him race. 

She looked glum as Lochte, who came in fifth, failed to medal in the event for the first time since his Olympic career began, winning silver in Athens and London and scoring a bronze in Beijing.  

Reid, 25, has been linked to the handsome Olympian since March and the pair have made little secret of their romance on social media. 

In an exclusive interview with Daily Mail Online she revealed the star had talked about retiring but was still on the fence about his participation in Tokyo four years from now.

'He's mentioned this might be his last one but then sometimes he says he thinks he will go again,' she said. 

Matthew and Camila, who were without children Levi, eight, Vida, six, and three-year-old Livingston for their Olympic jaunt, perfectly blended into the enthusiastic crowd.

Matthew proudly stood to watch Phelps receive his latest gold medal, placing his hand on his heart as the U.S. national anthem rang out.  

The 46-year-old star looked casual in a pale sweater, grey newsboy cap, and khaki trousers. 

Michael Phelps has kept Lochte off the top of the podium once again, scoring gold in the 200m individual medley for his fourth straight Olympics

Phelps seen competing in the first semi final of the Men's 100m Butterfly on Day 6 of the Rio Games at the Olympic Aquatics Stadium

Meeting the man: The U.S. swimming team posted a snap of the actor congratulating the sporting hero after his big swim

Kayla sported Lochte-themed glasses as she cheered on her boyfriend Ryan Lochte from the stands 

And although he wasn't dressed in the red, white and blue he has been wearing at other venues, he still opted to show a little Olympic spirit by decorating his identification lanyard with numerous Olympic-themed pins.

His Brazilian-born wife meanwhile, looked a little more colourful in a floral blazer over a white top and dark blue jeans.

The 34-year-old at times, looked a little distracted, playing with her phone in between smooches with her husband.   

Her long, wavy brunette locks were pushed over to her right side, while she kept her make-up to a minimum, save for a dab of pale rose lipstick.

The actor even took the chance to meet the record-breaking Olympian, posing with Phelps after the race for an Instagram snap. 

'@michaelphelps and @mcconaughey just hanging out at #rio2016,' the caption read.  

Me and my girl: Matthew McConaughey only had eyes for his stunning wife Camila Alves in the stands

Loved up: Matthew McConaughey shared a joke with his stunning wife of four years

Hand on heart: The couple stood proudly for the medal ceremony. Matthew placed his hand on his heart as the U.S. national anthem rang out

Dedicated: Matthew and Camila are continuing to show their enthusiasm for the Games

Selfie time! The actor happily posed for a fellow Olympic fan in the stands 

Keeping it simple: A grey newsboy cap, long-sleeve grey sweater and khakis rounded out his fanboy ensemble

Candy crush? Wife Camila seemed slightly less interested in the event, as she could be seen playing with her phone most of the time

Big fan: The beaming 46-year-old Dallas Buyers Club actor was so excited he had to stand up to cheer on the pool-bound Americans several times throughout the event

Having any fun? Matthew was cheery as he watched the swimmers take to the pool

After witnessing Phelps' record 22nd medal win, the couple decided to keep things casual as they went for a romantic dinner date.

However, the relaxed pair were happy to meet and greet fans on their night out, posing for a few pictures in the street. 

Matthew recently opened up about his excitement for the Olympic games.

'It's the first time I've been to the Olympics, actually,' the True Detective actor told CBC. 

Acknowledging that his wife was born in the host country, he said: 'We're always looking for a reason to be here and this gave us a really good reason.'

He was also full of praise for his Olympic experience so far, saying: 'I think Rio and Brazil's doing a good job of hosting.'

Lots to see: After witnessing Phelps' record 22nd medal win, the couple decided to keep things casual as they went for a romantic dinner date

All full? Matthew and Camila left the dining establishment looking satisfied

They care! Even though it must have been quite enjoyable to spend some time together without the family, after dinner the duo still decided to take a few pictures with eager fans

Garnering a crowd: Camila is also quite famous in Brazil, albeit as a model

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Camila Alves returned to her native Brazil to cheer on the USA team along with her husband Matthew McConaughey during the Olympic games in Rio de Janeiro.

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Phelps kept Lochte off the top of the podium for the last time Thursday, scoring first in the 200m individual medley and nabbing his 22nd Olympic gold medal.

The most decorated Olympian of all time surged ahead of his competitors in the final lap, and made the number four with his fingers as he celebrated with a roaring Rio crowd that has not tired of seeing him win.

Phelps has not lost the event since his Olympic debut in the 2004 Athens games, making it his fourth straight win. 

The race began with a huge roar from the massive Team USA contingent who applauded wildly and broke into chants of USA.

Lochte, who has struggled with a groin injury in recent weeks, was ahead at the half-stage but he quickly tired and Japan's Kosuke Hagino took silver and Wang Shun of China grabbed bronze.

The race was billed as the closing chapter of a superstar rivalry that has lit up successive Games since 2004. 

Three times Lochte has come up against Phelps in the final of the men's 200 individual medley and three times he has lost out to his illustrious teammate. 

Lochte, who led the pack during the breaststroke, came in a surprising fifth in Thursday night's race 

 Lochte failed to medal in the event for the first time since his Olympic debut with Phelps in the 2004 Athens games

Boomer Phelps donned his patriotic ear defenders to watch dad's race at the Olympic Aquatics Stadium in Rio on Thursday

Johnson clearly wasn't feeling nervous for her groom-to-be as she cradled Boomer while waiting of the race to begin 

The most decorated Olympian of all time surged ahead of his competitors for the win in the final lap of the race 

Phelps now has 22 gold medals, four of which he has racked up during his incredible run in Rio 

With Phelps set to retire after Rio 2016, the pair will never meet again on this stage and he was understated in his celebrations and quick to embrace Lochte, who pulled off his swim cap in disappointment.

Ever the sportsman, Lochte congratulated his teammate in the pool before Phelps took his victory lap.  

The Olympian couldn't hold back tears as he took his place on the top spot of the podium once again.

He said afterwards it was still a dream to win gold, even if he has repeated the feat 22 times. 

'I say this a lot, but every single day I'm living a dream come true, he explained. 'As a kid I wanted to do something that no one had ever done before and I'm enjoying it.

'Being able to finish how I won is just something very special to me and this is why you are seeing more and more emotion on the medal podium.

'You know as a kid, it's not like pulling teeth to get me in the pool anymore. I want to finish my career how I want to, so that's what I'm doing.' 

Phelps was visibly emotional as he stood on the podium and relished in another incredible win 

Phelps was joined on the podium by Japan's Kosuke Hakino, who took home silver, and Wang Shun of China 

The Olympian couldn't hold back tears as he kissed his medal and looked on at the adoring crowd 

Phelps will have once more chance to add to his trophy case on Thursday after qualifying for the Men's 100m butterfly final just 30 minutes after taking gold 

Phelps had fun with the cameras as he celebrated his win, before jetting off to the changing room to get back into the pool for his final Olympic semifinals heat 

Paying tribute to his family, he said: 'Every single time I come out I try to look up and see Nicole, my mom, Boomer and the rest of my family.

'It brings tears to my eyes because I want to hold him and hang out with him more.'  

Lochte, meanwhile, spoke of his disappointment at coming fifth in what will possibly be his final Olympic race.

'I wish that end was a lot better. It is what it is,' he said. 'My swimming career has been good and I'm so thankful for the gifts and talent that I've been given.

'But I had to work at it. Day in and day out for so many years, I just wish it ended up better.'

Lochte refused to say whether he would retire but said he needed a 'mental break' from the sport.

'I can't say this is over,' he added. 'If anything, I think especially that race, it helped motivate me.' 

Lochte had his eyes on the times as Phelps received a congratulatory hug from Brazil's Thiago Pereira 

Phelps now has just one more race in Rio and also had to race in the semifinal of the Men's 100m butterfly on Thursday

The race was billed as the closing chapter of a superstar rivalry that has lit up successive Games since 2004

'There are a lot of things I need to change in the next four years if I want to come back into the sport. But for right now I think I need a break mentally. Who knows. It could be for a day, it could be ten days, two years. 

'I just know I need physical and mental tapering.' 

Lochte also paid a glowing tribute to his close friend and erstwhile rival Phelps, saying he was not convinced he would follow through on plans to retire. 

'Going against him is a dream come true,' he said. 'Especially what he has done in the sport. He has changed it.

'He's one of the best, not swimmer ever, best athlete in the Olympics. For me, being able to push him for so many years, we bring the best out of each other.

'He said that's it. I think I said it in the call room today that I'm not going to believe it until I see it, so we will see what happens.'

The most decorated Olympian of all time already looked set for victory in the race as he sailed through the semifinal on Wednesday night.

Three times Lochte has come up against Phelps in the final of the men's 200 individual medley and three times he has lost out to his illustrious teammate

Lochte had won silver in the event in Athens and London, and came home with the bronze in the 2008 games 

With Phelps set to retire after Rio 2016, the pair will never meet again on this stage

Lochte, a 12-time medalist, was close behind Phelps and seemed to have at least a silver medal in the bag in his only individual race in Rio.

'I love racing him. I think, for me, he brings out the best in me,' Phelps said of his friendly longtime rival after the race.

Lochte agreed, adding: 'We bring out the best in each other. Any time I get up and race him, it's the best.'

The pair won gold together just days ago in the Men's 4x200m freestyle relay. 

And Phelps and Lochte were clearly feeling nostalgic as their final Olympic race together neared. 

Lochte tweeted a picture that showed the two eating pasta dinners side-by-side before their race on Thursday night. 

Academy Award-winning actor Eddie Redmayne (center) and his wife Hannah Bagshawe were in the stadium to watch the swimming on Tuesday in Brazil. The couple pictured above cheering on the women's 200-meter individual medley race

The USA basketball team cheered on the men's relay team from the stands before taking a picture together backstage

DeAndre Jordan (right) takes a selfie with Kevin Durant (left) as they cheer on Team USA in the swimming competition

'One last time!' he wrote, including the hashtags #longjourney and #12years.   

Phelps only has one more event in Rio, and quickly had to jump off the podium and back into the pool to race in the Men's 100m butterfly semifinal. 

He cruised by with a comfortable second in his heat and qualified for the final tomorrow, where he will once again face off against South Africa's Chad le Clos. 

Boomer Phelps, as well as the swimmer's fiancee Nicole Johnson and his mother Deborah, were spotted once again in the stands waiting to cheer him on.

Phelps' adorable baby son has been the only person able to steal the spotlight from the unstoppable swimmer, who has now racked up four gold medals in Rio.

After the medal ceremony for the 200m butterfly earlier this week, Phelps broke ranks during the customary walk around the pool and bounded into the stands to plant a tender kiss on Boomer.

Phelps was quick to embrace Lochte, who was visibly disappointed following his surprising fifth place finish 

Lochte pulled off his swimming cap as he looked at the clock, later telling an NBC anchor: 'I gave it my all' 

Phelps (pictured here looking at the clock with Great Britain's James Guy) came second in his heat and qualified 

'You're going to bring tears to my eyes now,' the Olympian said when asked about the sweet moment.

'I wanted to be with him more,' he added. 'Being able to share that one moment that I had with him was definitely something very special.' 

Although it wasn't Lochte's best swim in the pool, it was a golden run for Team USA after an unusually disappointing spread of performances the night before.

Simone Manuel grabbed gold in the Women's 100m freestyle, making her the first African American woman to medal in an individual event.

It is the first gold for the United States in the race since 1984.

Phelps' family's smiles grew even bigger as they watched Phelps smash the competition

The Ravens even took a break during the second half of their game between the Carolina Panthers to cheer on Phelps, a native of Baltimore 

Meanwhile Phelps was preparing to face-off against Lochte for the last time as they shared one final pre-race pasta meal together 

Ryan Murphy also brought home another gold for Team USA, taking the top spot in the Men's 200m backstroke. 

Phelps will have once more chance to add to his trophy case on Thursday, but his rivals are already looking forward to his retirement.   

Shun, who took home the bronze on Thursday night, said he hopes to finally win races once Phelps retires.

'Michael Phelps is my idol. I am honored to be in this competition with him,' he said. 'I never thought about beating him because he's on a different level.

'Maybe when he retires I hope to become champion. I will work very hard for that.' 

Phelps wasn't the only American to nab gold on Thursday - Simone Manuel became the first African American woman to ever medal in an individual race after she tied for gold in the Women's 100m freestyle

Manuel shared gold with Canada's Penny Olesiak and Sarah Shostrom, of Sweden, took home the bronze 

Ryan Murphy was also able to add another gold medal to Team USA's trophy case after taking the top spot in the Men's 200m backstroke event