• Pippa Middleton watches the men's singles tennis final between Jo-Wilfried Tsonga of France and Roger Federer of Switzerland at the ATP World Tour Finals at the O2 Arena in London November 27, 2011.

Pippa Middleton watches the men's singles tennis final between Jo-Wilfried Tsonga of France and Roger Federer of Switzerland at the ATP World Tour Finals at the O2 Arena in London November 27, 2011. (Photo : REUTERS/TOBY MELVILLE)

Pippa Middleton, 31, recently showed off her sexy physique in a string bikini in her recent getaway to St.Barts.

According to People, the striking bikini featured a blue colored pattern and a beaded trim. Middleton wore the bikini while paddle boarding with her brother James Middleton who wore a pair of printed swimming trunks.

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Speaking about Middleton's vacation outfit, Claudine Davies, owner and founder of Biondi Couture told the website that it highlights Pippa's athletic built.

"We particularly love the picture of Pippa paddle boarding as, only recently, we were discussing in the boutique how much we all love this water sport," she said.

"Designer swimwear should not just be about design but - most importantly - fit well and provide full functionality. So this picture is a perfect reflection of the Biondi Collection ethos," she added.

Davies also said that Middleton has picked quite a few bikini pieces from their boutique as she likes our designs and attention to detailing.

Meanwhile, according to E! News, this is not the first time that Pippa has shown her envious figure in a red bikini during her Caribbean vacation. Earlier this week, she was seen sporting red bikini. Pippa's mother Carole Middleton has also accompanied her on the vacation.

Pippa is reportedly a health freak and participates in various sports events to maintain her body. She is currently preparing to compete in the Otillo Swim-Run World Championship in the waters on Sept. 7. James will also participate with her. She has previously participated in bicycle relay and African marathon.