Simply put: Who knew?!?

On the Glee Season 4 premiere, viewers will see a whole new side to Kate Hudson. She moves, she shakes, she seduces, she makes Rachel wonder: What have I gotten myself into? Am I no longer the best in class?!?

Fox has released the full performance of Hudson - as NYADA choreographer Cassandra July - singing and dancing to a mash-up of Lady Gaga's "Americano" and Jennifer Lopez's "Dance Again." It's pretty great stuff. See for yourself:

The season opener airs on Thursday, September 13 and fans can get an early listen now to a number of Glee songs to be featured on upcoming episodes.

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.