This is what we know so far about the upcoming Britney Spears tribute episode on Glee:

• It will air in September.
• It will be titled "Britney/Brittany."
• It will feature six Britney songs.
• It will prominently feature Heather Morris (as Brittany) on lead vocals.

Based on a recent photo of Lea Michelle on set, though, it's clear that Rachel will be featured in at least one number. She's dressed exactly like Britney in the latter's "Baby One More Time" video below:

[Photo: PacificCoastNewsOnline.com]

Fans can get Gleeful again when the show premieres season two on September 21.

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