Brody, 33, and Meester, 27, have been dating since February. The pair worked together on the 2012 film The Oranges and are collaborating again on the upcoming comedy Life Partners.
Brody is most famous for his breakout role as Seth Cohen on the Fox drama The O.C. Meester's breakout role came on The CW's Gossip Girl,which ended last year. Both series were created by Josh Schwartz.
Emails to both actors' reps were not immediately returned.