The couple were wed on Saturday in Charleston, SC in front of less than 20 of their family members and friends, Peoplereported.
"We're private even though we like to go on reality shows," Hildreth told People about the small ceremony.
Wolff, who was already married when he competed on The Biggest Loser's third season and met Hildreth, proposed to Hildreth during NBC's broadcast of The Biggest Loser: Where Are They Now? reunion weigh-in special last fall.
Despite the small ceremony, the couple plans to throw a big party for the rest of their family members and friends, including some of their fellow former The Biggest Loserthird-season contestants. In addition, Wolff said the show's trainers will also be invited.
"But I don't know if they'll want to come to Omaha, Nebraska!" he told People.
Hildreth and Wolff told People they've been able to keep the majority of the weight off since participating in The Biggest Loser's third season in 2006, however they characterized their wedding as a "cheat day" from their diets.
"I have to have pizza at my wedding," Hildreth told People, whose desire was fulfilled with mini-pizza appetizers. In addition, the couple also had a cupcake tower for dessert.
"They're just so much more fun than a boring old wedding cake!" she told People.