Keira Knightley and Mark Ruffalo were spotted last week on the set of Can A Song Save Your Life? in New York City. The pair got really close while filming some scenes on the streets. That Ruffalo is one lucky guy, I wonder what Knightley's fiance thought about watching her kiss another dude?
PICTURES: Check out more on the Keira Knightley page
I don't know how I would feel if my fiance was a super hot and famous actress and then I had to watch her kiss a famous actor as part of her job. I'm not jealous or anything, I'm just really greedy. There is a difference, a huge difference. Actually, I know exactly how I would feel if my fiance was a super hot and famous actress...ecstatic!

