Grey's Anatomy star T.R. Knight (George) and his new love, Mark Cornelsen, do a bit of strolling together in The Hollywood Hills on Sunday.

According to the source of this great photo, T.R. Knight and Cornelsen were house hunting at the time. They must be getting pretty serious!

For those interested, Mark Cornelsen wore a t-shirt stating "We All Have AIDS." This is to promote a new campaign to end the stigma surrounding HIV/AIDS and call attention to the 40 million men, women, and children living with it globally.

For more information on We All Have AIDS - which features celebrities like Tom Hanks, Will Smith, Elizabeth Taylor, Whoopi Goldberg, Elton John, Alicia Keys, Richard Gere and Nelson Mandela among its many activists - follow the link.

Also, T.R. Knight turned 35 last Wednesday, the 26th. Our apologies for missing this last week, and here's wishing a happy belated birthday to our man T.R.!

Steve Marsi is the Managing Editor of TV Fanatic. Follow him on Google+ or email him here.