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'Runner Runner' stars hit Las Vegas, and more Celeb Sightings

Image: Justin Timberlake, Gemma Arterton and Ben Affleck
LAS VEGAS, NV - SEPTEMBER 18: (L-R) Singer/actor Justin Timberlake, actress Gemma Arterton and actor/director Ben Affleck introduce the world premiere of Twentieth Century Fox and New Regency's film \"Runner Runner\" at Planet Hollywood Resort & Casino on September 18, 2013 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images)Ethan Miller / Getty Images
Celebrity Sightings

Slideshow  37 photos

Celebrity Sightings

Stars at the 'Runner Runner' premiere, Christina Aguilera on Leno, Chris Hemsworth on the 'Rush' red carpet, and more.