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Keri Hilson is known for her sexy voice and just as intriguing sex appeal.

The R&B singer decided to switch things up on us and use her celebrity for a different reason yesterday.

Keri hosted  “Project Butterfly,” a T.E.E.N. DIARIES self-esteem program that was held in New York City.

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The goal of Project Butterfly: New York was to focus on health and fitness and to support First Lady Michelle Obama’s “Let’s Move” campaign.

100 teenage girls were granted an opportunity to discuss their self-esteem issues with Keri Hilson who is an avid supporter of “Project Butterfly.”

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The event showed girls that not only do Pretty Girls Rock, but Pretty Girls Sweat!

Work it!