Does Emma Watson have a secret smoking habit? She was left breathless after showing off a few dance moves on Jimmy Fallon last night, while Fallon himself hardly looked put out at all. Still she’s the hottest thing going in Hollywood right now.

With Kristen Stewart’s fall from grace from her cheating scandal, Watson is at the top of young Hollywood’s A-List, coming off her new film “The Perks of Being a Wallflower.”

The former Harry Potter actress was in New York yesterday (Sept. 13) promoting her film, which also stars Adam Higenbuch, Johnny Simmons, Logan Lerman, Ezra Miller and Erin Wilhelmi.

Fallon set up the bit by showing Watson rehearsing a dance from her new movie. Fallon, who likes to mix it up with guests, asked Watson for a lesson and she happily obliged.

“Yeah, for sure,” she said. “Are you down?”

The two performed some classy moves from movie classics like Gene Kelly’s “Singin’ in the Rain,” John Travolta’s “Grease” and Patrick Swayze’s classic movie “Dirty Dancing.”

The band seemed a little befuddled because it didn’t know the songs, but Fallon and Watson glided around the dance floor. Emma may have been a little more nervous than she put on.

The diminutive 22-year-old actress was breathing pretty hard by the time the skit was over. But she looked wildly sexy dancing in a short flowered dress. Check out the video below and click here to follow TheImproper on Twitter for more Emma Watson updates.