Keira Knightley in an EATING competition with Sienna Miller!

Actresses Keira Knightley and Sienna Miller have been having competitions to see who can eat the most.

The two beauties - who are currently in Wales filming for their new movie 'The Edge of Love' - reportedly "stunned" insiders on the set with how much food they can both scoff.

A source said: "Both Keira and Sienna have bigger appetites than many of the men on set. Keira was told to beef up for the role and she and Sienna have been having food competitions to see who can eat the most.

"At the moment they are on a curry diet where they can have curries for lunch and dinner, and eggs Benedict for breakfast."

Despite her healthy appetite, Keira recently had to quash claims she was anorexic.