This is a Romantic Comedy Starring Chris O'Donnell & Rene Zellwegger.
Jimmie Shannon (Chris O'Donnell) wants to be a bachelor forever: a wild 'Mustang', free and never tied down. Eventually though, after three years he proposes to his girlfriend Anne (Renée Zellweger), in the most romantic restaurant in town—only he spoils the special occasion with a very crude approach. Anne is going to Greece for an assignment when Jimmie discovers his grandfather James Shannon (Peter Ustinov) has died and left him the family business, all his assets, and $100 million. But Jimmie can only have it if he is married by 6:05 p.m. on his 30th birthday, which happens to be the next day. He, his friend Marco (Artie Lange), and his grandfather's two friends and colleagues (Ed Asner and Hal Holbrook) must find a bride in the next few hours. With a priest (James Cromwell) in tow, they begin.