#1. Ruben Studdard
American Idol winner in 2003 has made a tremendous transformation in losing weight. While on the show The Biggest Loser Studdard got eliminated from the show, yet he stayed motivated and revealed his success in 2014; Studdard lost 119lbs while being on The Biggest Loser and lost over 50 more pounds after getting released from the show. Feeling content and emotionally excited Studdard comes out with another album.