A site where you enter actor's names and it will list what movie(s) they star together?

I saw a movie that had a brunette and redhead who were supposed to dislike each other but at the close of the film it is revealed that they were working together to cover up a crime. I think Sandra Bullock or Demi Moore played the brunette and some who looks a lot like Siaohban Fallon Hogan or Kathy Griffin played the redhead. I know it's a long shot but I remember it ended with the redhead in a police station clearing or providing an alibi for the brunette and when she walks out and gets in the passenger seat of a car it is revealed that the brunette had been waiting for her. I think the brunette killed her husband but I'm not sure.