Just when we thought that 'Community' season 4 had booked up all the guest stars it had to offer across its 13-episode span, gravity knocks us to the ground. Singer/song-writer Sara Bareilles is the latest to sign on for an appearance in an upcoming episode of the struggling NBC comedy, appearing in "Intro to Felt Surrogacy," the upcoming puppet episode that also features 'Seinfeld' vet Jason Alexander. Find out who Sara Bareilles will play in the final episodes of 'Community' inside!

"Gravity" singer/song-writer Sara Bareilles has always been something of an inside joke for 'Community,' the song having been featured in a number of fan-made shipping videos, before actually appearing on the series itself in parody. Now, Bareilles herself will have the last laugh, as TVLine reveals the singer will appear in upcoming puppetry episode 'Intro to Felt Surrogacy."

Despite the joke associated with the singer, Bareilles won't play herself in the April 11 episode, the surrounding details of which are being kept under wraps. We do however know that the episode will feature the Greendale gang's balloon going down, after which the group encounters an oddball mountain man (Jason Alexander). Actress Brie Larson will also appear in an upcoming episode, though no details have yet been made available about her role.

What say you? Are you intrigued to see if 'Community' goes meta for its Sara Bareilles appearance? How have you been enjoying the new season?