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Celebrities Visit "Late Show With David Letterman" - February 20, 2013

NEW YORK, NY - FEBRUARY 20: Actress Zosia Mamet arrives to "Late Show with David Letterman" at Ed Sullivan Theater on February 20, 2013 in New York City. (Photo by Jeffrey Ufberg/WireImage)

Worst-Dressed Celebs -- Week of 2/18

Vanessa Hudgens, Selena Gomez, and Oprah delivered this week's biggest fashion flubs. -- By Matt Whitfield