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SAN FRANCISCO, CA - AUGUST 21: Actress Emily Ratajkowski and actor Zac Efron introduce 'We Are Your Friends' for the audience on August 21, 2015 in San Francisco, California. (Photo by Miikka Skaffari/Getty Images)

SAN FRANCISCO, CA - AUGUST 21:  Actress Emily Ratajkowski and actor Zac Efron introduce 'We Are Your Friends' for the audience on August 21, 2015 in San Francisco, California.  (Photo by Miikka Skaffari/Getty Images)