Cate Blanchett, Sandra Bullock, Mila Kunis, Gabrielle Union, And More | How Well Do You Know Your Co-Star | Marie Claire

Stars like Mila Kunis, Gabrielle Union, Sandra Bullock, and more join Marie Claire for a game of 'How Well Do You Know Your Co-Star' and the results are nothing short of hilarious.

We've compiled some of your favorite costar pairings to see which cast really knows each other best and who knows nothing at all about their co-stars, and the answers may surprise you.