Jennifer Aniston Eric Ray Davidson/Entertainment Weekly Office Christmas Party is no ordinary holiday movie. And Jennifer Aniston, who plays a joyless CEO, knows a thing or two about unconventional holidays. "When I was a kid, they used to make me belly dance. On Christmas Eve. My dad's side of the family is Greek, so I would dress up as a little Greek girl and then on Christmas, after taking belly-dancing classes, I would do that. It had nothing to do with Christmas, even," she recalled in Entertainment Weekly's Dec. 9 issue.