Leighton Meester dating Garrett Hedlund?

Leighton Meester has reportedly begun dating Garrett Hedlund.

The pair, who star together in the new movie Country Strong, were allegedly seen kissing at a Golden Globes after-party on Sunday night.

An onlooker told E! Online: "They were making googly eyes at each other all night, it was adorable.

"They were hanging out by the bar laughing and talking very close for a long time. He had his hand on her back and she was just looking up at him, smiling ear-to-ear as he was leaning down and whispering something to her."

They added: "At one point they turned around and snuck a kiss. But as the night went on they didn't exactly hide their affection for each other. They were all over each other! They seemed really happy."