The trailer for Four Christmases thoroughly explains the premise of the film, beginning with Witherspoon and Vaughn play a couple who spend usually avoid spending Christmas with their families by going on an exotic vacation. Unfortunately, when their flight is canceled and the couple are interviewed on national television, they can not avoid their families for another holiday and are forced to participate in four separate celebrations as their parents have divorced. As the couple interact with their families, the trailer reveals why they usually try to escape these family gatherings.Official Site: Four Christmases

• "It's the story of a couple trying to avoid the holidays, but forced not only into celebrating Christmas, but into spending it with their respective families as well. I'm sure at the end the positive message of Christmas overwhelms them and there's some glowing moment where they all get into the spirit of the thing, but the movie's first trailer is mostly just Reese Witherspoon being vomited on while Vince Vaughn stands by complaining. Now that's my kind of Christmas movie."—CinemaBlendCinemaBlend: Four Christmases Trailer (September 13, 2008)
• "Four Christmases is your standard big budget Holiday comedy full of all the shenanigans that we see over and over every year. Sure it might be charming, sure it might be funny, but it's not going to be the next Holiday classic. Unfortunately Vince Vaughn's humor is getting a bit old and Reese Witherspoon hasn't been funny since American Psycho. Please don't tell me you think this looks good?"—First ShowingFirst Showing: Vince Vaughn and Reese Witherspoon's Four Christmases Trailer (September 12, 2008)

• Reese Witherspoon as Kate
• Vince Vaughn as Brad
• Kristin Chenoweth as Courtney
• Sissy Spacek as Paula, Brad's mom
• Mary Steenburgen as Marilyn, Kate's mom
• Jon Voight as Creighton, Kate's dad
• Robert Duvall as Howard, Brad's dad
• Dwight Yoakam as Pastor Phil
• Tim McGraw as Dallas