The Grammy Awards in LA on Sunday night gave music's biggest names a chance to mingle inside the show once the red carpet wrapped up. Jennifer Lopez and Casper Smart laughed it up with Nicole Kidman and Keith Urban in the audience while Portia de Rossi and Ellen DeGeneres got goofy with Katy Perry. Lena Dunham showed loved to boyfriend Jack Antonoff and Beyoncé chatted up Adele. Carey Mulligan congratulated her husband Marcus Mumford after his win with Mumford and Sons, but that's not all that happened — 
