This year's Billboard Music Awards went down in Las Vegas on Sunday night, and they did not disappoint. Between Britney Spears's nostalgic red carpet arrival and epic performance of greatest hits and striking couples like Mila Kunis and Ashton Kutcher, plus a heartbreaking speech from Celine Dion, the evening was full of truly memorable moments — many of which you probably didn't see on TV. Scroll through for the best pictures of stars on their big night at the Billboard Awards.
23 of the Cutest Billboard Music Awards Pictures
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