Credit: Cobra Snake; Matt Baron/BEImages

There's been an underground trend emerging in Hollywood—Havaianas Midnight Swim parties! Courteney Cox and David Arquette kicked things off, hosting one at their Malibu home this summer and two more of the secret events have happened since—Nicky Hilton and Shenae Grimes were spotted at the Beverly Hills party. And now Havaianas is extending the movement to your own backyard or pool club. The flip flop brand is asking fans to host their own Midnight Swim Party, take fun snapshots and then post a picture to their Facebook or Twitter (tagged #midnightswimclub). Every week, Havaianas will award the best pool party pic with a limited-edition pair of Midnight Swim Club Havaianas.