Apparently, Knightley and Miller have been having competitions to see who can eat the most.
A source claimed that both the actresses have bigger appetites than most of the men on the set.
"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 both been having food competitions to see who can eat the most," the Daily Mail quoted the spy, as saying.
'At the moment they are on a curry diet where they have curries for lunch and dinner, and eggs Benedict for breakfast," the source added.