FIRST LOOK! Heather Morris Leads Glee Flash Mob in Leather Mini Skirt - Us Weekly

The battle for McKinley High class president is officially on!

One week after Brittany (Heather Morris) helped Kurt (Chris Colfer) with his campaign on Glee, the ditzy blonde cheerleader has decided to throw her own hat in the ring.

As this exclusive behind-the-scenes photo from Tuesday's all-new Glee episode shows, Brittany is willing to pull out all the stops to win votes. In the scene depicted here, Morris, 24, is preparing with show choreographers and production execs to perform a flash mob for her fellow students.

Also on Tuesday's show: Mercedes (Amber Riley) battles Rachel (Rachel Berry) for the lead role in the McKinley musical West Side Story. "Screw West Side Story, this is Clash of the Titans," Mark Salling as Puck says in a new promo for the episode.

And the diva dual sends shockwaves through McKinley High. Says Kurt to Rachel, as a word of caution: "Ten years from now, you'll be thinking about the friends you had, and the ones you tossed aside."

Catch the full episode of Glee, titled "Asian F," Tuesday at 8 p.m. (EST) on FOX.

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