Last night's 2013 Met Gala may have been all about serious fashion, but Joshua Jackson still managed to have a little fun on the red carpet.
Accompanied by his longtime girlfriend Diane Kruger, Jackson made a wide-eyed, open-mouthed funny face right behind Hathaway as she glamorously made her way down the press line.
While we're not sure if Jackson photobombed Hathaway on purpose, we can still enjoy the resulting silly shot.
The 34-year-old hunky actor looked chic during the photo op in a black Dior Homme suit with white shirt and bright red tie.
Meanwhile, Hathaway looked absolutely gorgeous in her sexy sheer, floor-length Valentino gown.
Tune in to E! News Tuesday at 7 p.m. for even more from the Met Gala.