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Ashley and Mary-Kate Olsen Threw Themselves an Olympic-Themed Birthday Party

The 29-year-old sisters had a lot to celebrate.

Fresh off of their CFDA Awards win for Womenswear Designer of the Year, the twin sisters behind The Row, Ashley and Mary-Kate Olsen, hit another milestone on Saturday: their 29th birthday. With some of their dearest friends in tow, the Olsens headed to the Hamptons where they threw themselves a party of Olympic proportions — well, at least it was Olympic in theme — that included competitive track and field games, a dunk tank and fireworks. The ladies even had America-themed t-shirts made for each team, allowing guests to proudly declare their allegiance to a single sister for the day.

Read on for scenes from the Olsens' birthday bash from Instagram, and for the record, Team Ashley won.

Homepage photo: Andrew H. Walker/Getty Images

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