As “Glee” fans continue to swallow the news that Lea Michele, Cory Monteith, and Chris Colfer are done after season 3, the young stars are already looking to the future.

Making for quite the monumental change, three key members of the "Glee" cast will be saying their goodbyes prior to the show's fourth season.

Among the hit FOX cast members opting to venture away from the show that brought them stardom are Lea Michele (Rachel Berry), Chris Colfer (Kurt Hummel) and Cory Montieth (Finn hudson).

He's one of Prospect High's shining stars, but life for Cory Monteith hasn't always been that bright - having dealt with a serious drug problem and unsuccessful bouts with rehab.

The "Glee" star opened up about his past addiction in the new issue of Parade magazine (out June 26), telling, "I burned a lot of bridges," while also dishing that his drug use involved "anything and everything, as much as possible...I had a serious problem."