Darren Criss' cover of Katy Perry's Teenage Dream is 'Glee's' biggest hit yet.

According to Nikki Finke's Deadline Hollywood, the track debuted at #1 in digital track sales with 214,000 copies sold, making it the show's biggest hit yet.

Blaine, an out and proud student at a rival glee club named the Dalton Academy Warblers, played by Criss, sings the song to Chris Colfer's gay McKinley High student Kurt Hummel. (The video is embedded in the right panel of this page.)

Blaine's addition to the show created a buzz among fans who speculated that his character would woo Hummel. But his debut two weeks ago in the suggestively titled Never Been Kissed episode presented Blaine as more a mentor than a love interest for Hummel.

Glee ringmaster Ryan Murphy, however, recently said he has yet to decide whether the pair will become an item.

The incredible buzz, positive feedback and record sales certainly helped convince Murphy to sign Criss on as a series regular.