Jealous!
Leighton Meester‘s boyfriend Sebastian Stan is seriously so adorable.
The Gossip Girl star and her super cute boyfriend partied it up in Vegas over the weekend, where Meester gave a surprise performance at the Hard Rock’s Body English nightclub!
Leighton performed a couple of tracks for the rowdy crowd with DJ Clinton Sparks on Saturday before calling it a night.
Her hot boyfriend must be so proud!
[Image via Scott Berry/Hard Rock Hotel & Casino..]