Blondes may have more fun, and brunettes may have more ambition. But they've got nothing on lavender-hued Demi Lovato. The 21-year-old is famous for her always-changing tresses, currently a lively lavender-silver ombré. We've seen her hair take on practically every shade of a mood ring, from bubble gum pink to teal-green ombré. So how does the "Neon Lights" singer settle on the perfect shade?Lovato tells E! News, "I love going on Pinterest and looking at different hair colors.