How Michelle Williams Gained 15 Pounds

Michelle Williams and Ryan Gosling found themselves in an unusual rivalry while filming Blue Valentine -- seeing who could gain the most weight for their roles.

"She ended up winning. She gained about 15, 16 pounds. He gained 14," the film's director, Derek Cianfrance, told PEOPLE at Monday's Gotham Independent Film Awards sponsored by Euphoria Calvin Klein.

Read more on people.com