Adam Lambert joins Glee's cast

"I am thrilled to announce that the super talented Adam Lambert is joining the cast of 'Glee' this fall," showrunner Ryan Murphy announced.

Details of who Lambert will be playing remain unclear. Representatives for studio 20th Century Fox Television and Fox did not immediately have details on whether the role is a series regular, recurring or guest spot.

"Glee is really irresistible -- it's charming," he said at the time, noting he'd love to be able to play himself on the series. (Lambert most recently played himself and performed on ABC Family's Pretty Little Liars.)

"Glee" has a history of booking big-name guest stars. Sarah Jessica Parker and Kate Hudson both had recurring roles during Glee's fourth season as the series split its focus between its Ohio-set high school and New York, where stars Lea Michele and Chris Colfer are prominently featured.

"Glee" returns with its fifth season Thursday, Sept. 19 at 9 p.m. on Fox.