HOT GALLERY: Backstage Fun at the Grammys

It's not just a party onstage at the Grammys, it's a fun old time backstage as well! Kevin Jonas, will.i.am, Nick Jonas and Joe Jonas bonded behind the scenes, while Robert Downey Jr., Jennifer Lopez, Seal, Pink, Lady Gaga, Sir Elton John and more also relaxed after performing and presenting on Sunday night in L.A. at the Staples Center.