Scarlett Johansson and Hangover star Justin Bartha dating?

Scarlett Johansson is rumored to be in a relationship with Justin Bartha, an actor from The Hangover movie. He is also Ashley Olsen’s ex, with whom he broke up this past winter.

This weekend, Johansson attended the premiere of the play All New People in which Bartha stars. The piece is written by Zach Braff and it was presented on Broadway in New York.

The actress then went backstage to congratulate the actors and even dined with them.

According to a witness cited by the New York Post, Scarlett and Justin were inseparable and spent much of the night “completely engrossed in each other.”

“They seemed pretty fascinated with each other and only talked to each other,” the source continues. “It looked sometimes flirty, but also they seemed to be involved in a deep discussion.”

However, a source close to the 26-year-old actress claims the rumors are false: “The truth of the matter is they are just friends.”

Recently, Scarlett’s ex-husband, Ryan Reynolds –was also romantically linked to Charlize Theron.