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Bradley Cooper arrived at Jimmy Kimmel Live! with a smile on his face and a backpack in his hand on Tuesday afternoon, and we have to say, the Silver Linings Playbook star looked quite dapper!

We're not sure what was in the bag, but we can tell you what Coop was up to over the weekend ... partying with fellow stars Leonardo DiCaprio, Jonah Hill, Gerard Butler and Mel Gibson at the Miami club Story! Leo and Bradley reportedly sprayed fellow club-goers with water guns, and the next night the group partied at LIV at Fontainebleau. Hopefully he's caught up on his sleep since then...