Kristen Wiig, Ben Stiller, Sean Penn, and more attend the AFI Fest premiere of The Secret Life of Walter Mitty; Jennifer Hudson is honored with a star on the Hollywood Walk of Fame; Kylie Jenner, Mario Lopez, and Mel B. step out for the grand opening of Sugar Factory in Hollywood; Matt Damon, Chelsea Handler, and Nikki Reed show support for Jason Patric's "Stand Up for Gus" Benefit; Guess and Harper's Bazaar host a poolside dinner party on the roof of The London—see how Hollywood celebrated Hump Day in this edition of Last Night's Parties.
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