Brittany (Heather Morris) dreams of being Britney Spears in the "Britney/Brittany" episode of GLEE airing Tuesday, Sept. 28 (8:00-9:00 PM ET/PT) on FOX. ©2010 Fox Broadcasting Co. Cr: Adam Rose/FOX

Heather Morris, who stars as Brittany on Glee (8:00 p.m. ET/PT, FOX), will be performing as Britney Spears in tonight’s episode.

Morris admits she played it cool when series creator Ryan Murphy told her about the episode, but her insides were secretly jumpin’ for the chance to play her teen idol.

And look for rumored live tweeting from Spears herself as the episode rolls out.

Click onto media bar for the day Heather Morris found out she’d be playing Britney Spears on Glee.