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"The Hangover III" - Los Angeles Premiere - Arrivals

WESTWOOD, CA - MAY 20: Actor Zach Galifianakis arrives at the Los Angeles premiere of "The Hangover III" at Mann's Village Theatre on May 20, 2013 in Westwood, California. (Photo by Gregg DeGuire/WireImage)

Celeb Style Snafus (week of 5/20/2013)

Janet Jackson, Dennis Rodman, and Brooklyn Decker wear the week's worst outfits. -- By Matt Whitfield