T.R. Knight Laughs Out Loud

Grey’s Anatomy actor T.R. Knight shares a laugh with boyfriend Mark Cornelsen while out and about in Los Feliz, Los Angeles on Tuesday afternoon.

T.R., 35, and Mark, 19, were both seen carrying journals/diaries and chatting with an older woman.

Last week, co-star Katherine Heigl visited T.R. at his house in Los Feliz.

10+ pictures inside of T.R. and Mark getting their giggles on…