'Gossip Girl' star Leighton Meester is reportedly involved with Justin Long, after being spotted out with him on a romantic dinner date.

People reports that Meester dined with the actor in the French bistro, La Poubelle, in Hollywood last Sunday.

The couple allegedly held hands while leaving the restaurant at around midnight.

An onlooker commented: "They were happily willing to talk to fans who approached them."

Representatives for the stars have yet to comments on the rumours of the potential new romance.