Age: 23
Hockey legend Wayne Gretzky’s daughter has been singing for years; her song “Collecting Dust” was even featured on an episode of MTV’s Laguna Beach. Ultimately, however, it wasn’t her singing career (which she is currently focused on reviving) that got her noticed, it was her tweets. If she can stir up that much fuss in 140 characters, best believe she'll score a hit pop single sooner than later.