T.R. Knight is married man!

The onetime 'Grey's Anatomy' star, who played George O'Malley opposite Katherine Heigl's Izzie Stevens on the series from 2005 to 2009, married his longtime boyfriend, Patrick.

The couple swapped vows on Friday, Oct. 4.

The ceremony was a small one, attended by friends and family, including Heigl, whose career has been struggling since she left 'Grey's' and developed a reputation for being difficult. The actress flew in for the ceremony, so regardless of what people say about her on-set behavior, she is obviously a good friend!

"It [was] very small and quiet," a source confirmed to Us Weekly.

Knight, 40, is playing Mercutio in an off-Broadway production of 'Romeo & Juliet' in NYC. He did not perform on Friday and Saturday, since he had other things to attend to -- like getting hitched!

Knight, who also appeared on 'The Good Wife,' was embroiled in a major controversy in 2007 when 'Grey's' co-star Isaiah Washington reportedly called him a "f-----." Washington was fired and Knight went on to say that hearing himself referred to as such gave him the courage to come out.

So it was a negative situation that turned into a positive one!

PopCrush congrats T.R. and Patrick on their nuptials!