Justin Bieber was tootin' around West Hollywood this weekend as reports of his tryst with Kourtney Kardashian emerged. Such fun! Meanwhile, a healthy-looking Amanda Bynes went to a holiday party, and Prince Harry paid a visit to a hospital dedicated to finding a cure for AIDS.
Kylie Jenner went from a photoshoot (which saw her don lingerie and a pink wig) to Rihanna's second annual Diamond Ball, while Lisa Vanderpump was honored at a Brits in LA Event. See what other stars were up to in our star sightings round-up.
Hollywood's hottest hotties are shedding some layers and letting those sexy summer curves fly. Whether it's Demi Lovato's curvaceous figure or Beyonce's bootylicious booty, check everyone all out here!