Sad news for Glee fans: season 3 will be the last for three regular cast members, co-creator Ryan Murphy reveals. Can you guess which singing grads won't be back for season 4?

Lea Michele (Rachel Berry), Chris Colfer (Kurt Hummel), and Cory Monteith (Finn Hudson) won't be joining their New Directions peers after graduation.

"You can keep them on the show for six years and people will criticize you for not being realistic, or you can be really true to life and say when they started the show they were very clearly sophomores and they should graduate at the end of their senior year," Murphy said.

Sadly, Murphy also added that “more characters are leaving than are staying."

Will season 3 be too bittersweet to bear?