By Sharon Clott Kanter
Updated Feb 17, 2012 @ 11:40 am
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Credit: Sipa(2); AP Photo; Getty Images (2)

Our favorite outfits of the week—pulled from our Look of the Day top picks—are sleeveless pieces that show off the arms. Our standouts: Mom-to-be Sienna Miller in Boss Black and Pamela Love jewelry, Emmy Rossum in Donna Karan, Rooney Mara in Calvin Klein, Jessica Alba in Michael Kors, and Gwyneth Paltrow in Stella McCartney. Which one is your favorite? Vote in the poll below and let us know!