Hot "Hills" couple Heidi Montag and Spencer Pratt may not be legally married after eloping to Cabo San Lucas, Mexico, in November, but on New Year's Day they'll be there to help make it official for four lucky couples -- live on MTV!

On MTV's "Engaged & Underage: The Bridal Bowl," four couples ranging in age from 19-22 years old will be married live in front of a national audience at the network's Times Square studio in New York City. The four-hour special will begin at 1 p.m. EST, with a different couple walking down the aisle each hour.

Heidi and Spencer will host the show alongside MTV News correspondents Tim Kash and Kim Stoltz. The controversial "Hills" couple were set to make it official themselves at a Beverly Hills courthouse on the Dec. 22 finale of their reality show, but Spencer announced that he wanted to wait and give Heidi the lavish wedding she's always dreamed of.