Flat-stomached Rihanna oozes sex appeal and cool nonchalance in saucy bikini snap as she takes a well-earned break from her world tour

She's just wrapped the American leg of her Anti World Tour.

And Rihanna is clearly feeling in the mood to relax a bit before hitting Europe in June, as she shared a sultry bikini snap while soaking up the sun.

Taking a well-earned break, the 28-year-old singing superstar shared a picture of herself on Instagram as she leaned back on a sun-lounger.

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Time to relax: Rihanna shared a sexy bikini snap on her Instagram page on Thursday, as she took a well-earned break from her Anti World Tour

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Rihanna has been hard at work on the American leg of her Anti World Tour, so we don't blame her for wanting to kick back in a bikini.

The superstar singer soaked up some sun wearing a pair of futuristic shades, which she teamed with this itsy bitsy red triangle bikini top. It's by Vitamin A and it's exactly what the doctor ordered!

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Her flat and incredibly enviably toned stomach was the focus of the picture, her eye-catching tattoo underneath her breast easily visible thanks to the barely-there bikini top.

The bright red halterneck swimwear top was a flattering fit for the singer, who also donned a small gold necklace to add some glamour to proceedings.

She also had the number 23 written in sun lotion on her taut tum, although the meaning behind the sloppy digits was unclear.

And, looking as cool as ever, the Umbrella hitmaker donned a pair of purple-tinted shades and rocked a black shade on her lips, showing that she's always thinking about her style no matter what.

Working hard: Rihanna, 28, has been touring North America relentlessly performing to thousands night after night, so it's no surprise she was ready to soak up some sunshine

Rihanna is set to return to her world tour in mid-June, when she heads to Europe to continue her dates there. Her first stop will be Amsterdam in the Netherlands on June 17, and from there she'll go on to locations including London, Glasgow, Hamburg, Milan and Barcelona. 

Meanwhile, as well as working hard and entertaining thousands of fans night after night, she has been making sure to have some fun, and was reported to have spent a cool $15k at a strip club over the weekend. 

And her spending spree began with a bang as she reportedly left bar staff a $200 tip after spending a mere $82.25 on drinks on Monday.

Better take my money! Rihanna's spending spree this week began with a bang as she reportedly left bar staff at The Lodge on 6th Street a $200 tip after spending a mere $82.25 on drinks on Monday

According to TMZ, the generous singer only spent 45 minutes at the The Lodge on 6th Street bar in Austin, arriving at 1.15 AM and leaving at closing time

Despite her superstar status, Rihanna also settled in among the fellow customers, with her bodyguard only said to intervene when girls attempted to follow her into the toilet. 

MailOnline contacted a representative for Rihanna for comment.

After her fleeting trip to the bar, she decided to continue the party at V Live strip club.

Popstar of the people! Despite her superstar status, Rihanna also settled in among the fellow customers, with her bodyguard only said to intervene when girls attempted to follow her into the toilet 

She had just performed for her Anti World Tour 2016 at the Toyota Center in Houston, and decided to celebrate with opener Travis Scott.

Much like in her 2012 single Pour It Up, the 28-year-old showed how she 'balls out,' reportedly dropping $15k during her two-hour visit, according to TMZ. 

Rihanna dressed casually for the outing, sporting a loose-fitting, black, graphic print short-sleeved T-shirt.

She coupled the T-shirt with a pair of figure-hugging light wash jeans, and hid her eyes behind white sunglasses. 

Throw it up, throw it up: Rihanna celebrated after a great show on Sunday evening by hitting V Live strip club in Houston, Texas, where she reportedly dropped $15k

Color her impressed: The hitmaker showed off a surprised faced as she stood in the club with her hands filled with a wad of cash

Time to unwind: Following her concert, Rihanna and her opener Travis Scott made their way to this strip club in Houston

Late night: The pair reportedly showed up around 3:30am, and stayed for two hours

She looked to be having a blast as videos on TMZ's site showed the club played music from her popular Anti album as she danced while throwing money.

The star - and her fellow performer - showed up at the Houston club around 3:30am, much to the crowd's enjoyment.

Rihanna could be seen entertaining the crowd as she danced along to her own songs while cheering on the performers and sharing the large sum of bills she had brought with her.

Laid-back: Rihanna kept comfortable for the night out, sporting a graphic print T-shirt, figure-hugging jeans, and white sunglasses

Center of attention: Crowds went wild for the star, who could be seen dancing at the club as her own music - from new album Anti - was played on the speakers

Sharing the wealth: Videos showed the star throwing wads of money to the performers and the crowd

That same night Rihanna had posted about performing in Houston, gushing: 'HOUSTON It don't get no betta than the way y'all went up tonight!!! Thank you from the bottom of my lil ratchet heart #ANTIWORLDTOUR.'

The star also shared a video of fans dancing as she could be heard off-screen performing hit B***h Better Have My Money.

Rihanna will next continue her tour as she travels to the Smoothie King Center in New Orleans, Louisiana. 

Work, work, work, work, work: Rihanna - who had everyone cheering as she threw money in the early hours of Monday morning - will next continue on to New Orleans for her Anti World Tour 2016