The lovely Leighton Meester stopped by Late Night with Conan O'Brien for an interview this week. Here's a photo of her outside ...

In the Gossip Girl star's interview, she said one of her nicknames was "Happy Feet" because of her love for dancing. So cute!

How much do you love Leighton Meester's smile?

You can watch a clip of Leighton's interview, in which she talks about Gossip Girl and shows off her dance moves, by clicking here!