After an event as major as the Met Gala, calling it an early night is simply not an option. After the hours of primping, prepping, and red carpet stepping, the post-ball parties are the A-Listers' only opportunity to finally let loose. From Rihanna's butt-baring arrival at Up & Down to Jay and Bey's regal entrance to The Top of The Standard, these after-party snaps show just how hard our favorite celebs can party.