Leighton Meester and Adam Brody at "The Oranges" premiere (Tumblr)

Brody, famous for his role as Seth Cohen on "The O.C.," and Meester, also known as "Gossip Girl's" Blair Waldorf, costarred together in the 2011 drama "The Oranges" and are rumored to have been secretly dating for weeks. While they've kept their relationship private, the pair traveled to Bangkok together earlier this year and have recently been photographed together grabbing lunch and heading to museum exhibits. 

Meester previously dated fellow actors Justin Long and Sebastian Stan, while Brody is most famous for his relationship with his "The O.C." costar Rachel Bilson. 

Reach Staff Reporter Leah Harari here.