Her name is Ali Vincent, but you can call her the "Biggest Loser!" Ali started at 234 lbs. and dropped to and amazing 122 lbs. -- losing 47% of her body weight -- in just 16 weeks! Now "Extra" reveals how Ali didn't let sweets sink her new diet, and her other secrets for a svelte physique!

Also, tune in to "Extra" for other top tips for a summer slim-down from the "Biggest Loser" trainers themselves, Bob Harper and Jillian Michaels.