LOS ANGELES (AP) – 'Glee' guest star Darren Criss has turned a 'Teenage Dream' into reality.

The Fox series' co-producer, Twentieth Television, says Criss and his character, prep school glee club member Blaine, will continue to appear on the show this season and that Criss could become a regular next year under a newly signed deal.

The 23-year-old's character was introduced last week as a mentor to Kurt (Chris Colfer), an out gay student who faces harassment at school. Criss and the glee club at his school performed a cover of Katy Perry's 'Teenage Dream' in that episode.

Twentieth Television says the cover scored the highest first-day sales for a 'Glee' track, with more than 55,000 downloads.

Criss returned on last night's episode of 'Glee', which featured guest star Gwyneth Paltrow as a substitute teacher.

Twentieth Television says whether Criss' character and Kurt become romantically involved has yet to be decided.