T.R. Knight and Mark Cornelsen are a sweet couple. At least in our opinion.

T.R. Knight and boyfriend Mark Cornelsen are content just hanging out. And we think they make a cute couple.

T.R. Knight with his boyfriend Mark Cornelsen in June 2008. We're happy that T.R. has found a nice guy like Mark and that they can do as they please in California regarding marriage - when and if they get to that stage, of course.

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 and Mark Cornelsen recently started dating and went public at the 2008 Elton John AIDS Foundation Oscar Party. They make a cute and happy couple!

Katherine Heigl, T.R. Knight and Katherine's mother Nancy Heigl in Paris, France, in February 2008. So cute how they remain such good friends off the set.

Here's a great picture of T. R. Knight.

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.

Katherine Heigl's upcoming wedding party will include co-star T.R. Knight, her best friend on-screen and in real life. They star will marry Josh Kelley December 23, 2007.

T.R. Knight and other Grey's Anatomy stars are backing the writers of TV shows, who are on strike as they seek better wages and distribution of online royalties.

Katherine Heigl and T.R. Knight are best buds off the screen - and really cute in that role, regardless of how you feel about them as lovers on Grey's Anatomy.