Watch Britneymania on 'Glee'!

As one of the most watched "Glee" episodes so far, Britney Spears and her music were all the rage on Tuesday's episode of "Glee"! Titled "Britney/Brittany," the show featured the pop mom's hits, including "Toxic," "Me Against the Music," "I'm a Slave 4 U," "Stronger" and breakout single "...Baby One More Time."

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If you missed it, watch the Britney Spears "Glee" episode here!

Dancer/actress Heather Morris did Britney proud, showing off slamming dance moves and mimicking some of the singer's sexiest looks. Spears approved, tweeting as she watched the show, "[Heather] was so fun to work with and was really sweet in person," adding later, "Jane Lynch scares me."