Leighton Meester & Justin Long: New Couple Alert?

Are Leighton Meester and Justin Long going public with a possible romance?

The 25-year-old actress and Justin, 32, held hands outside La Poubelle in Hollywood on Sunday (May 15) after a two-hour dinner date, People reports.

And Leighton isn’t the only Gossip Girl star who appears to have a new beau!

Co-star Blake Lively has been spending time with newly single Leonardo DiCaprio in Cannes, France.

Over the weekend, the two actors were spotted roaming around the Hotel du Cap-Eden-Roc, the NY Post reports. A few days later, Blake joined Leo, his BFF Lukas Haas, and director Steven Spielberg on a yacht.

Meanwhile, Leighton‘s ex, Sebastian Stan, was last spotted with Dianna Agron at DeLeon Tequila’s Two Year Anniversary party on Sunday at L.A.’s Chateau Marmont.

WHO DO YOU THINK makes the cutest couple: Leighton/Justin, Blake/Leo, or Sebastian/Dianna?