Pippa Middleton showed off her killer bikini body while on a vacation in St Barts. The 31-year-old showed off her enviable body while paddle boarding with her brother James Middleton. The brother-sister duo along with their mother is on a vacation in the Caribbean.

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The younger sister of the Duchess of Cambridge, Kate Middleton flaunted her washboard abs in a white, blue and purple colored two-piece, E! News reported. Pippa put her muscular physique in full display as she soaked up some sun with her brother.

The writer's bikini is by Biondi. It adds a bling factor with an opal beaded detailing. The top ties at the neck and back, while the bottom ties on the sides.

Pippa accessorized with a pair of sunglass and a sleek bangle. Her brunette tresses were pulled back and tied into a single braid.

The 31-year-old was pictured riding on the surfboard along with her younger James. The youngest sibling of the Middleton sisters kept it simple in colourful, swimming trunks, matching with his sister's bathing suit.

His shorts resembled a tropical island. James opted for a shirtless look also flaunting his impressive abs.

Meanwhile, this is not the first time that Pippa has been seen wearing a bikini and flaunting her workout body. The columnist and writer also showed off her washboard abs in a red bikini Monday, when the brother-sister duo along with their mother and friend were seen sailing on a pontoon.

Her solid red Bia tube bikini featured 24 karat gold-plated adjustable sliding tube detail, straps that tie behind the neck and back and comes in a lycra blended fabric. Meanwhile, the bottom featured a similar 24 karat gold-plated adjustable sliding tube and ViX logo detail on back.

The brunette beauty is known to work for her enviable body. Apart from going to the gym, she goes for bike rides, participates in charity bike rides, marathons, and other athletic events.

The Middleton family is spending some time at Eden Rock resort. The luxury hotel resort is owned by the family of Pippa's former boyfriend and investment banker James Matthews. The vacationers have been enjoyng in their own villa with a private pool. The group have also been dining at some of the fanciest restaurants in St. Barts. 

TagsPippa Middleton, bikini body, St Barts vacation, brother James Middleton, paddle boarding