Britney Spears joined Rihanna on stage to perform a sexy rendition of RiRi's hit song "S&M" — which ended with the duo kissing on stage — opening this year's Billboard Awards. Brit's been out and about quite a bit this month and she's sticking with her fail-safe beauty look of curly hair and a smoky eye. (Obviously she doesn't tend to take her sparkly chains out with her to charity functions.) Do you think she could've jazzed up her on-stage beauty look a little more?
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