WATCH: Kelly Osbourne Becomes a Pussycat Doll

Kelly Osbourne showed off her post-"Dancing with the Stars" bod in a form-fitting catsuit as the newest addition to the Pussycat Dolls!

Kelly served as a special member of the sexy group on Wednesday night in LA. Bing celebrated the end of their summer long Sunset Strip Concert Series with a girl-power extravaganza put on by the Pussycat Dolls

Confident in her skin and pulling her corset oh so tight, Kelly said, "This is my version of Sasha Fierce," in reference to Beyonce's alter ego. "You should have seen us all getting ready and singing and dancing in the room and makeup and lip-gloss and glitter everywhere."