The gang's (almost) all here for the holidays!

As bumbling family patriarch Clark Griswold, Chevy Chase memorably made Christmas a hilarious, pratfall-tastic time in 1989's National Lampoon's Christmas Vacation -- the third flick in the popular series about the Griswold clan's misadventures on the American road, in Europe and in Vegas.

Over twenty years later, Chase, now 69 years old, recreates one of the more memorable scenes from the chestnut for an Old Navy ad -- reuniting with his onscreen wife, Beverly D'Angelo and daughter, Juliette Lewis.

As Clark, Chase gets psyched to unveil the over-the-top holiday lighting scheme for his home as his family members (including D'Angelo and Lewis) look on nervously. (In the film, the illumination nearly blinds an irate neighbor, played by Julia Louis-Dreyfus.)

Check out the funny reunion (with a voiceover from Martin Short) now!