Bradley Cooper closed the book on The Hangover trilogy with his onscreen "wolfpack" made up of Ed Helms, Zach Galifianakis, and Justin Bartha last year, but he didn't say goodbye to the boys. They share a close bond off screen as well, and Bradley can count his Hangover crew among his many A-list friendships. He's BFFs with Dax Shepard, has hit the club scene with Leonardo DiCaprio and Jonah Hill, and couldn't get enough of pal Ben Affleck during award season. So who does he consider his real-life wolfpack? Keep Reading to see Bradley with all of his bros!