updated 05/23/2013 AT 11:00 AM ET
•originally published 05/23/2013 AT 2:00 PM ET
While in town for the Cannes Film Festival, the actor, 38, was photographed partying at Gotha Club on Monday with his friend, fellow actor Lukas Haas – and a mystery woman.
Keeping a low profile in a newsboy hat, the Great Gatsby star, 38, was spotted giving a thumbs up to a woman in a white top. Later, she mimicked his gesture and returned it with a smile.