REESE Witherspoon and Vince Vaughn fail to impress in this lifeless romantic comedy.

Happily unmarried San Francisco couple Brad (Vaughn) and Kate (Witherspoon) have been together for years but have no plans to walk down the aisle.

Every December 25, the lovebirds make outlandish, charity work-related excuses to their loved ones so they can jet off to sunnier climes to soak up the sun.

But when the fog sets in and they are unable to fly, the bickering duo are forced to spend the holiday season with their extended families.

A tinsel-strewn re-tread of Meet The Parents that doesn't quite make the cut.