Dancing with the Stars contestant Kelly Osbourne may have just started her dance training, but she tells Life & Style that she already looks the part of a svelte dancer. "I've been doing five hours of rehearsals a day -- sometimes even six hours," the 24-year-old told Life & Style during a signing event for her new book Fierce in London. "I also do an hour of Pilates every day. It's so much fun."

And the proof is in her pants size, as the former yo-yo dieter dropped roughly 14 pounds without any fad diets! Even her competition has noticed her new body, as DWTS contestant Aaron Carter tells Life & Style, "She's my competition, but I have to admit, she looks great."

For more on Kelly's amazing slimdown secrets, pick up the new issue of Life & Style, on newsstands tomorrow!

Photo Credit: ABC