Katy Perry, Miley Cyrus, Mario Lopez, and more catch the debut of Britney: Piece of Me at Planet Hollywood; Olivia Munn, Kellan Lutz, Nicky Hilton, Derek Hough, and Ryan Lochte are among the many to hit the opening festivities for Beacher's Madhouse Las Vegas; John Legend and Chrissy Teigen celebrate New Year's Eve at HAZE Nightclub—get the rundown on the celebs who poured into Las Vegas to kiss the last days of 2013 good-bye and ring in 2014 in this special edition of Last Night's Parties.
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