The couple hit Grammy winners Kings of Leon's exclusive post-party held at Teddy's, where they held hands and stayed by each other's side all night.
"They were dancing, singing, laughing," says a source, who adds that JT even had a dance-off with a friend.
Newlyweds Scarlett Johansson and Ryan Reynolds also attended the bash, sponsored by Belvedere IX. The two were spotted kissing at the soiree, where Ryan, appropriately enough, sipped Belvedere IX-and-cranberry cocktails.
Also attending the party: Katy Perry, Kid Rock and Slash.