By Rita Kokshanian
Updated Aug 25, 2015 @ 10:15 am
Credit: Splash News

It's official—Pippa Middleton is royally hot. Kate Middleton's younger sister hit the water in St. Barts last week while on vacation with her family, and the royal in-law looked good to say the least. For the occasion, Middleton donned a skimpy red Vix bikini ($184,, which perfectly showcased her impeccably toned physique. Looks like all of those marathons and long-distance bike rides are paying off!

Pippa was joined by her younger brother, James Middleton, as well as her mother, Carole Middleton. The trio was accompanied by James Matthews, Pippa's former boyfriend, whose family owns the Eden Rock - St Barth's Hotel, and it looks like they were enjoying their stay—the foursome was spotted goofing around and playfully pushing each other into the water.