Emmy Rossum: Justin Long Makes Me Laugh Too Much on 'Comet'!

Emmy Rossum rocks cool kicks while walking on the set of her new film Comet on Monday (June 17) in Los Angeles.

The 26-year-old actress was joined on the set by her co-star Justin Long, who plays her love interest in the film.

PHOTOS: Check out the latest pics of Emmy Rossum

“On set with @justinlong who makes me laugh too much on set. I can’t keep a straight face. Curses!!! #comet #cometthemovie,” Emmy tweeted on the same day.

Last week, Justin and Emmy filmed an emotional scene on a balcony.

FYI: Emmy is wearing Gerard Darel sneakers.

20+ pictures inside of Emmy Rossum and Justin Long on the set of Comet…