who plays in the movie four christmases

The main characters in the movie "Four Christmases" are Brad and Kate (played by Vince Vaughn and Reese Witherspoon). In the film, they decide to skip spending the holiday with their respective families to go on a tropical vacation instead. However, when their flight is canceled, they are forced to spend the holidays with their divorced parents and siblings, each of whom has their own issues and conflicts. The movie is a comedy that follows their journey through the various holiday celebrations and the challenges they face along the way.