A clip from the highly anticipated episode featuring Britney Spears' music has been released.
To be shown on US TV next week, it showcases the vocals and sizzling dance moves of Heather Morris – aptly named Brittany on the show.
In the episode Brittany, the series' promiscuous cheerleader, persuades their teacher Mr Schuester to choreograph a Britney homage – despite the fact he considers her "too edgy".
And the princess of pop herself also filmed a cameo for Glee.
Afterwards she tweeted about 'the fun' she was having on set.
"What's up GLEEKS?" she said. "Can't wait for you guys to see the episode!"