Mar 25, 08 09:48 AM

David Schwimmer, Saffron Burrows and Jennifer Finnigan signed autographs for fans as they arrived at last night's premiere of Run, Fat Boy, Run in Los Angeles.

Directed by Schwimmer, the film tells the story of a chunky, clueless guy who leaves his pregnant fiancée on their wedding day only to discover -- 5 years later -- that she is his one true love. But in order to win back her heart, he looks to finish his first marathon while making her realize her new man is the wrong guy for her.

Run, Fat Boy, Run is due in US theaters on March 28.