Pippa Middleton shows off her post-pregnancy body flaunting washboard abs in racy bikini

The 35-year-old Pippa Middleton, Kate Middleton's sisters, stunned beachgoers when she showed off her post-pregnancy body in a skimpy white bikini.

Her son Arthur is only 11 weeks old, and Pippa already shed the excess pregnancy kilograms and wasted no time in getting her hourglass figure back.

She was spotted while vacationing with her husband, James Matthews, on St. Barts, a Caribbean island, earlier this month.

Pippa tied the knot with Matthews, a former race driver turned hedge fund manager, in 2017 and the fairytale ceremony was held at her parents home in Berkshire.

The couple welcomed their son back in October after only announcing the pregnancy four months earlier. Pippa's stunning figure is thanks to her staying fit during pregnancy.

She has kept active throughout her pregnancy by swimming and doing barre-style workouts, along with following a healthy diet. She explained:

“I’m fanatical about sport and have looked at loads of books and websites on exercise during pregnancy but have been disappointed by the limited technical information on what you can and can’t do. I decided to use my own initiative and adapted my current exercise routine, adjusting the weight and intensity to what felt right for me.”

Middleton, ever the fashion icon, maintained her sense of style throughout the trying nine months and stunned with her choice of maternity style outfits.

Days before arriving at the Lindo Wing, she was the center of attention at Princess Eugenie's wedding to Jack Brooksbank at St. George's Chapel.

She wore a high neck emerald green dress and accessorized with a matching fascinator, emerald jewelry, and black high heels.

Like her sister, Pippa also has an eye for style and was recently spotted in a red Ralph Lauren dress, which retails at $465.

She matched it with a tan bag and Ray-ban sunglasses. Pippa wore a pastel green dress with a pink floral print to Prince Harry and Meghan's wedding back in May.

Learn more about Pippa Middleton by following our Twitter account, @amomama_usa.