Darren Criss, Chord Overstreet Darren Criss, Chord Overstreet

Darren Criss and Harry Shum Jr. have been promoted to series regulars on Glee, but the same cannot be said for Chord Overstreet, whose option to join the cast full-time was not picked up, TVGuide.com has confirmed.

Criss' promotion comes as no surprise. The day after his debut on the show as Blaine, Warblers soloist and potential love interest for Kurt (Chris Colfer), there were already talks he would become a series regular.

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Unfortunately for fans of Overstreet and his Bieber-like hair helmet, he will probably only be back as a guest star next season. Late Friday, Overstreet tweeted, "Well it's been a good year too bad it's over, time for summer and starting fresh."

The news comes just two weeks after Glee creator Ryan Murphy told Ryan Seacrest on his KIIS-FM morning radio show that he plans to have several of the regular characters graduate from McKinley High School this season.

The news was first reported by TVLine.com.