Monteith reveals Glee finale tears

Glee's Cory Monteith has admitted filming the show's season finale has been a "bittersweet" experience for the cast.

Cory's character Finn Hudson is set to graduate from McKinley High, along with several other key castmates, at the end of the season.

The cast have tweeted about filming the emotional scenes, and speaking at a screening in Los Angeles, Cory confessed there have been some tears on set.

"It's like tearful happiness, because we're all really excited and happy for where the show's gone and going, but at the same time, we're sad that it's changing," he said.

"It's been such a mainstay for us, such an important part of our lives, obviously, and it's changing, and so it's been bittersweet."

The fate of Finn and fiancee Rachel, played by Lea Michele, hangs in the balance as the end of season three approaches, with the pair hoping to follow their dreams and move to New York.

But the 29-year-old actor refused to divulge any secrets about whether a happy ending was in sight for the couple.

"It's really good," he said. "I'm really excited about everything that's coming our way, but I can't say anything!"