Glee, Darren Criss

Beth Dubber/FOX

Update: A source tells us Grant Gustin's deal is not completely done yet, and "we are not finalizing any season four regulars until May." Grant himself just tweeted: "Thanks for all the congrats but this news is not official as of yet."

Klaine fans, prepare for battle!

We've learned exclusively that Glee has granted a series regular status to one of this season's most controversial recurring characters.

So who's the guy sticking around the Fox hit series next season?

GLEE, Grant Gustin

Beth Dubber/FOX

Grant Gustin, who made his Glee debut this season as Warbler Sebastian, has been made a series regular for season four, sources reveal to us exclusively.

We're hearing Gustin will recur throughout the rest of this season and has a real breakout episode with the upcoming Michael Jackson tribute.

Kurt (Chris Colfer) and Blaine (Darren Criss) fans may be less than thrilled by the news, but a little bird tells us Sebastian's crush on Blaine lessens in upcoming episodes.

It remains to be seen if Sebastian will be transferring to McKinley High next season. Today, it was announced that a Glee spinoff will not be happening and the graduating seniors will remain on the series.

A Fox rep could not confirm the news.

Glee fans, how do we feel about this casting update? Do you love to hate Sebastian, hate to love him or just hate him? Sound off in the comments!

PHOTOS: Glee Super Gallery!

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