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"Glee" star Cory Monteith has checked into rehab.

His rep told ABCNews.com that the actor "has voluntarily admitted himself to a treatment facility for substance addiction."

"He graciously asks for your respect and privacy as he takes the necessary steps towards recovery," the rep added in the statement.

This isn't the first time the 30-year-old actor, who stars as Finn Hudson on Fox's music-themed comedy-drama, has been to rehab. In a 2011 interview with Parade magazine, Montieth said he got treatment at 19 for his addiction struggles that included taking "anything and everything." He told Parade that he was "lucky to be alive."

He is currently dating "Glee" co-star Lea Michele. She told People, "I love and support Cory and will stand by him through this."

"I am grateful and proud he made this decision," she said.