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Darren Criss, Kermit

BRANDON HICKMAN

When you're feeling froggy, you just gotta leap (or strum a guitar and sing with Kermit the Frog in Darren Criss' case). 

The Glee star and Kermit the Frog teamed up for a cutesy duet getting teased on E!'s Oscar Countdown today, but before the duo gets their "Rainbow Connection" on (we'll have the exclusive video online this afternoon), they gave us a peek at what was in store.

Darren Criss, Kermit

BRANDON HICKMAN

"At rehearsal with Kermit. And I thought I had a froggy voice! #Muppets #ERedCarpet," Criss wrote on his WhoSay account, posting a photo of himself and the Muppets main man by the Hollywood Roosevelt's swanky pool Saturday.

"Can barely contain myself. Not only do I get to meet one of my all-time biggest heroes, Kermit The Frog—I get to sing with him too! For E!'s Oscar countdown on Sunday! @eonline #eredcarpet," Criss tweeted Saturday as well.

The pair is performing together in celebration of the Oscar-nominated song "Man or Muppet" from The Muppet Movie.