In this holiday comedy, Academy Award and Golden Globe-winner Reese Witherspoon ("Walk the Line," "Legally Blonde") stars with Vince Vaughn ("Wedding Crashers," "The Break-Up") as an upscale, happily unmarried San Francisco couple, Kate and Brad, who find themselves socked in by fog on Christmas morning and as a result, their exotic vacation plans morphed into the family-centric holiday they had, until now, gleefully avoided. Out of obligation and unable to escape they trudge to not one, not two, but four relative-choked festivities, increasingly mortified to find childhood fears raised, adolescent wounds reopened...and their very future together uncertain. As Brad counts the hours to when he can get away from their parents, step-parents, siblings and an assortment of nieces and nephews, Kate is starting to hear the ticking of a different kind of clock. And by the end of the day, she is beginning to wonder if their crazy families' choices are not so crazy after all.