Kelly Osbourne shows off 50-pound weight loss on Shape cover

kellie-osbourne-jump.jpg Kelly Osbourne has been flaunting her svelte new self for months, and she's finally opening up about the dramatic body change in bikini-clad photo shoot for the December 2010 issue of Shape.

In her interview with the magazine, the former "Dancing With the Stars" contestant credits a lot the change to her partner on the show, Louis van Amstel.