Pippa Middleton showed off her famous butt in a pair of patterned yoga pants and RadarOnline.com has a gallery of Kate Middleton's super-hot sister hitting the gym before the next royal baby is born.
Pippa hit the gym in a pair of skin-tight yoga pants in London before her sister Kate gives birth to her second child.
Her Royal Hotness showed off her famous butt in the form-fitting pants.
Pippa's pert derriere was on display in her cute workout gear.
The day of Kate's fairy tale wedding to Prince William her sister's bum, in the Alexander McQueen bridesmaid dress, almost stole the show.
The 31-year-old is an avid athlete, competing in skiing and running competitions all over the world.
Pippa and Kate both share the same long brown locks.
The future Queen's sister once likened her booty to Kim Kardashian's, telling the Spectator: "I must say that mine — though it has enjoyed fleeting fame — is not comparable."
Once rumored to be dating Prince Harry, Pippa was snapped heading out of the gym as the birth of Kate's second baby was imminent.