"Major!" described one of our editors as we gathered around to watch the newly-released promo for Glee's Britney Spears episode! And boy is he right. Featuring a montage of Rachel (Lea Michele) and Brittany (Heather Morris) in all of Spears' sexiest, most provacative costumes, dancing to the hipnotic beats of her greatest hits like "Toxic" and "Baby One More Time," it's no wonder Sue Sylvester is shaking in her tracksuit. The sure-to-be epic episode airs next Tuesday on FOX. Check out the clip above and tell us your favorite Britney Spears moment in the comments section below!