Actor TR Knight, who is best known for playing Dr. George O'Malley on the ABC medical drama Grey's Anatomy, married his boyfriend Patrick on Friday in upstate New York.

Us Weekly reported that the former Grey's Anatomy star married in an intimate ceremony described by an insider as “very small and quiet.”

Former costars Katherine Heigl and Kate Walsh attended the wedding.

“Having the time of my life at said wedding with @katewalsh [husband] @joshkelley Kate's amazing fella Chris & my girl Chey!” Heigl tweeted.

Knight, 40, and Patrick have been together three years.

Knight left Grey's Anatomy in 2009, several years after he and co-star Isaiah Washington were involved in an altercation in which Washington hurled a gay slur at Knight.

The incident made headlines and shortly thereafter Knight publicly acknowledged his sexual orientation.

Knight is currently playing the role of Mercutio in an off-Broadway production of Romeo & Juliet in New York City.