Robin Wright joined Foster on diet regime

Los Angeles :Actress Robin Wright went on a strict diet with partner Ben Foster when the latter had to get in shape to play cyclist Lance Armstrong in a new biopic.

The "Forrest Gump" star had to curb her cravings for calorific treats while following the diet. "My fiancé did a movie recently, playing Lance Armstrong, and he was on an 800 calories-a-day diet. I said, `In solidarity, I am going to go on the diet with you,` even though I really want to go to an in-and-out burger," she said. Wright was previously married to actor Sean Penn.