Jon Favreau has come aboard New Line Cinema's upcoming romantic comedy Four Christmases. According to The Hollywood Reporter, singers Tim McGraw and Dwight Yoakam have also joined the cast of this Seth Gordon directed project.

Vince Vaughn and Reese Witherspoon will star as a married couple, both with two sets of parents. On Christmas day, they are forced with the task of visiting all four families. Favreau and McGraw will be playing Vaughn's bullying brothers. Yoakam is set to play Pastor Phil, one of the four step dads.

Sissy Spacek, Kristin Chenoweth and Robert Duvall will also appear in the film. Four Christmases will be released next Christmas.

Four Christmases was released November 26th, 2008 and stars Vince Vaughn, Reese Witherspoon, Robert Duvall, Sissy Spacek, Jon Voight, Jon Favreau, Mary Steenburgen, Dwight Yoakam. The film is directed by Seth Gordon.