Ashley Olsen Gets the Runs

Ashley Olsen's New Year's resolution must be to start exercising ... and dressing more like her ragamuffin sister, Mary-Kate.

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Wearing the latest hipster aerobic ensemble of industrial strength leggings, vintage grunge-era flannel and 2005 oversized shades, Ash pounded the pavement -- sans venti coffee drink -- in L.A. on Monday.

No word on what her goal weight is.