By Leah Ornstein - Radar Style & Beauty Editor
Princess Kate's smoking hot sister Pippa Middleton was out and about in London on Friday, showing off her bombshell booty in tight spandex shortsduring her morning jog before changing into a perfect polka dot dress - and RadarOnline.com has the photos.
Her Royal Hotness, who is devoted to keeping her body in tip-top shape, left little to the imagination, flaunting her figure in skintight spandex running shorts, which she paired with a Nike shirt and her BVLGARI shades.
After sweating up a storm, she changed into a blue and green polka dot frock and black peep-toes and did a little shopping.
It's a tough life!