"I love and support Cory and will stand by him through this," Michele said in a statement. "I am grateful and proud he made this decision."
Monteith's rep revealed today that the Glee actor "voluntarily" checked into a treatment facility for addiction.
Michele's statement echoes a tweet she posted earlier today. "Feeling so grateful today," she posted.
Just three days ago, Monteith tweeted, "such a beautiful day! Truly seeing the forest for the trees. #gratitude."
A source says that Monteith's stint in rehab will not affect the shooting of Glee's two remaining episodes of the season.
A history of Glee romances