Mary-Kate is a Billy Joel Headbanger

Mary-Kate Olsen takes a break from filming Weeds and rocks out at a Billy Joel concert at the Hampton Social @ the Ross School on Saturday in East Hampton, New York.

Just last week, she attended the Hollywood premiere of Weeds. The Showtime series is set to kick off its third season one week from tomorrow, Monday, August 13.

Bigger MK pictures inside…

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Photos: Mat Szwajkos/Getty Images for Hampton Social @ Ross
Posted to: Mary-Kate Olsen, Olsen Twins
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