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LONDON, ENGLAND - AUGUST 11: Zac Efron and Emily Ratajkowski attend the European Premiere of "We Are Your Friends" at Ritzy Brixton on August 11, 2015 in London, England. (Photo by Samir Hussein/WireImage)

LONDON, ENGLAND - AUGUST 11:  Zac Efron and Emily Ratajkowski attend the European Premiere of "We Are Your Friends" at Ritzy Brixton on August 11, 2015 in London, England.  (Photo by Samir Hussein/WireImage)