Dad-to-be Jay Z parties the day away at star-studded Grammy brunch... while Beyoncé rests at home ahead of first pregnant performance at the awards

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He and his wife Beyoncé announced they were expecting twins last week. 

So it is no wonder Jay Z was in the mood to celebrate as he arrived at Roc Nation's exclusive pre-Grammy brunch in LA on Saturday.

The rapper, 47, appeared to be in incredibly high spirits at the bash as he laughed and danced with a number of celebrity pals - while Beyoncé stayed at home, to rest ahead of her first pregnant performance at the awards ceremony on Sunday night.

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Living it up: Jay Z, 47, was in high spirits at the Roc Nation pre-Grammy brunch in LA on Saturday, in light of the news he is expecting twins with his wife Beyonce

Gimme five! The rapper partied with a number of showbiz pals, like Rihanna (above) - while Beyoncé stayed at home to rest ahead of her first pregnant performance at the awards

The 99 Problems hitmaker certainly dressed up for the occasion, held at the swanky Owlwood Estate, as he arrived in a three-piece suit. 

Following a classic style with a clean double-breasted blazer, waistcoat and tailored trousers, the look was then made more striking by its rust hue.

Keeping the look casual however, the rapper layered a plain white T-shirt underneath and left his jacket undone as he relaxed at the bash with a number of high-profile friends.  

Suited and booted: The 99 Problems hitmaker certainly dressed up for the occasion, held at the swanky Owlwood Estate, as he arrived in a three-piece suit of a striking rust hue

Low-key: Keeping the look casual, the rapper layered a plain white T-shirt underneath and left his jacket undone as he relaxed with a number of high-profile pals, like Rihanna (above)

Old friends: Jay, whose real name is Shawn Carter, first enjoyed a catch up with pop star Rihanna, who looked typically stylish in an orange crop top and white trousers

Jay, whose real name is Shawn Carter, first enjoyed a catch up with pop star Rihanna, who looked typically stylish in an orange crop top and white trousers.

The pair, who have collaborated numerous times, were seen laughing animatedly together before exchanging a high-five as they bid each other farewell - no doubt celebrating both their Grammy nods and Jay Z's exciting baby news.

In high spirits for the duration of the day, the rapper then mingled with Nick Jonas and Jaden Smith, before tucking into an ice-cream with old friend P. Diddy. 

Boys will be boys: In high spirits for the duration of the day, the rapper then mingled with Nick Jonas (right) who he shared a cigar with

Next generation: He then moved on to Will Smith's son Jaden (left), who matched his style in a co-ordinating burgundy jacket

Satisfying their hunger for the day, Jay and Diddy, who was born Sean Combs, then switched to the harder stuff as the party got into full swing - dancing around together with both a cigar and a gold bottle of champagne. 

The businessman was no doubt in good spirits as he looked forward to Sunday night's Grammy Awards at the event - where he has bagged a nomination in the Best Rap Performance category for Pop Style, alongside Drake and Kanye West.

The gong marks a whopping 64 nominations by the rapper at the awards since 1999, and will be his twenty second win if the song reigns supreme on the night.

Hungry? He then tucked into an ice-cream with old friend P. Diddy (above)

Chilling out: Satisfying their hunger for the day, Jay and Diddy, who was born Sean Combs, then switched to the harder stuff as the party got into full swing

Friends in high places: The star, formerly known as Puff Daddy, cuddled up to British singer Emeli Sandé 

Looking ace: The pair were seen laughing and joking together as they danced around with an extravagant gold bottle of champagne

However the 2017 ceremony, held at the Staples Center in LA, is made even more exciting by the fact his wife Beyoncé will be performing pregnant for the first time. 

The singer, 35, announced the news that she and Jay were expecting twins - their second and third children together - on Instagram last week.

The ethereal snap showed the Crazy In Love star clad in a long veil and surrounded by flowers as she tenderly clutched onto her blossoming bump. 

She added an emotional caption which read: 'We would like to share our love and happiness. We have been blessed two times over. 

Man of the hour: The businessman was no doubt in good spirits ahead Grammys - where he has bagged a nomination for Best Rap Performance (here with P Diddy and Fat Joe, left)

Reason to celebrate: However the rapper mingled at the bash while wife Beyoncé stayed at home ahead of her first pregnant performance at the awards on Sunday night

'We are incredibly grateful that our family will be growing by two, and we thank you for your well wishes. - The Carters.' 

It has since been reported that the pop diva, who is up for a huge nine awards following her album Lemonade, and Jay will be seated front and centre at the bash.

While the hugely successful duo are evidently looking forward to the evening however, several world-renowned artists have decided to give the ceremony a miss - including Kanye West, who features on the song Jay Z is nominated for.

According to TMZ, both the Gold Digger rapper, who is up for eight awards, and singer Justin Bieber, who has four nods at the bash, are planning to skip the show as they believe it has become 'irrelevant'. 

'[Justin] just doesn't think the Grammys are relevant or representative, especially when it comes to young singers,' a source told the site last month. 

Congratulations: The singer, 35, announced the news that she and Jay were expecting twins - their second and third children together - on Instagram last week (above)