The Biggest Loser season 15 will air its finale Tuesday night, with only three contestants left as finalists.

There are only three contestants left: 28-year-old Bobby Saleem from Chicago, Ill., 43-year-old David Brown from Edmond, Okla. and 24-year-old Rachel Frederickson from Los Angeles, Calif.

Thus far in the competition, Rachel is in the lead having lost 42.3% of her body weight. The 24-year-old's starting weight was 260 lbs. but she has dropped down to 150 ahead of the finale. Meanwhile, David is not far behind having dropped from 409 lb.s to 243 lbs. He has dropped 40.6% of his weight.

Bobby is trailing the other finalists slightly, having lost 35.5% of his weight. He started at 358 lbs. but has since dropped to 231.

The Biggest Loser finale will feature contestant Ruben Studdard performing his new single Meant to Be, which will be accompanied by acclaimed pianist David Foster.

The finale will include an update on season 14's Kid Ambassadors. Biingo, Lindsay and Sunny will return to reveal how they're doing now, as will select favorite contestants from five past seasons of the show.

There will also be a reunion of all of season 15's contestants, who will reveal their weight loss progress after being eliminated from the show. Each of them is eligible for the "at home" prize of $100,000.

Trainers Jillian Michaels, Bob Harper and Dolvett Quince will introduce special audience members who have been inspired by the show to go on their own weight loss programs.

The winner's announcement will take place at the end of the show, with either Bobby, David or Rachel taking home the $250,000 grand prize.

The Biggest Loser season 15 finale will air Tuesday at 9 p.m. on NBC.