Gleeks, get ready for [lastfm]Britney Spears[/lastfm] overload! Tuesday’s episode of “[lastfm]Glee[/lastfm]” will feature the Pop idol’s greatest hits. We even have a preview clip!

In the episode titled “Britney/Brittany,” dimwitted cheerleader Brittany channels (you guessed it) her inner Britney Spears. It isn’t too hard for her to do so considering she has a little medicinal help.

In this preview clip, Brittany and fellow Cheerio Santana visit Dr. Carl (a dentist played by guest star [lastfm]John Stamos[/lastfm]). This is no routine teeth cleaning. They request, or rather demand, that he give them anesthesia. No one wants to cross an unmedicated Santana.  He gives in, gives them the drugs and the two drift off into dreamland which is actually the set of Spears’ “Me Against The Music” video.

Brittany and Santana do their best pop star impersonations and the results are pretty accurate. Check out the clip below to see for yourself!  Come back tomorrow to listen to all tracks from Tuesday’s episode plus new, hot pictures in our photo gallery.

Thanks to our friends at Movin 99.7 for contributing to this post.