Katherine Heigl and T.R. Knight are the best of friends - on and off the set of Grey's Anatomy. It's always fun to see them out and about.

T.R. Knight is not leaving Grey's Anatomy, contrary to rumors circulating in January 2007.

Katherine Heigl, T.R. Knight and Sara Ramirez were joined by Isaiah Washington and other stars as they picketed alongside striking writers in December 2007. Hopefully the strike will come to an end soon.

Katie, Kate, T.R., Sandra and Ellen share the glory.

Grey's Anatomy stars Katherine Heigl and T.R. Knight shopping last week. Very cute photo!

At the Tony Awards after party.

The cast of the ABC hit series Grey's Anatomy, Season 3 style. They won many awards and earned a lot of money.

He's out of the closet and happy about it.

T.R. Knight, who plays Dr. George O'Malley.

T.R. Knight and boyfriend Mark Cornelsen are happy together - even living together. But they're not getting married - at least not yet.

T.R. Knight and Mark Cornelsen are dating and reportedly quite happy together. We're happy, in turn, for one of our favorite Grey's Anatomy stars.

T.R. Knight at the 23rd annual AIDS Walk Los Angeles. We love this actor and the personality he brings to Dr. George O'Malley every Thursday.