Jon Favreau and country music stars Tim McGraw and Dwight Yoakam are hoppin' in the saddle with Reese Witherspoon and Vince Vaughn for New Line Cinema's romantic comedy "Four Christmases."

Jon Favreau and country music stars Tim McGraw and Dwight Yoakam are hoppin' in the saddle with Reese Witherspoon and Vince Vaughn for New Line Cinema's romantic comedy "Four Christmases."

Favreau and McGraw will play Dallas and Denver, respectively, two bullying siblings who delight in tormenting their brother, Brad (Vaughn), during the holidays.

Yoakam will play Pastor Phil, the overly zealous partner of Brad's new wife Kate's (Witherspoon) mother (Mary Steenburgen). He persuades the young couple to act in his church's nativity play, one of many chaotic events during their visits to different sets of parents.

Sissy Spacek, Kristin Chenoweth and Robert Duvall also star in the Spyglass Entertainment production for director Seth Gordon, which is set for release during next year's holiday season.

Between recording albums and touring with wife Faith Hill, McGraw has appeared in such features as "Friday Night Lights" and "The Kingdom." Yoakam has a more extensive screen resume, taking supporting roles in "Sling Blade," "Panic Room," "Hollywood Homicide" and "Wedding Crashers."