John Krasinski wants to be Matt Damon's best friend.

'The Office' USA star - who first met the 'We Bought A Zoo' actor through his British wife Emily Blunt when she filmed the movie 'The Adjustment Bureau' with him in 2011 - thinks the father-of-four is the coolest guy in Hollywood and is jealous of his best pal Ben Affleck.

The 33-year-old actor told ''Matt is one of the coolest guys I know, and I'm totally in love with the guy, but he doesn't even know my name.

''I would love to have a bromance with him but I don't even know if I could even use the word 'bromance' because he and Ben are so tight and like a married couple that I'll never get in there.

''I must be the bromance mistress. I'm on the outside of the relationship, only working with him on the side while really he's suppose to be with Ben. I'm clearly the mistress and this has got to change!''

John stars with Matt in their new movie 'Promised Land'.