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SAN FRANCISCO, CA - AUGUST 21: Actor Zac Efron and actress Emily Ratajkowski join on stage with DJ Anna Lunoe at 'We Are Your Friends' tour afterparty on August 21, 2015 in San Francisco, California. (Photo by Miikka Skaffari/Getty Images)

SAN FRANCISCO, CA - AUGUST 21:  Actor Zac Efron and actress Emily Ratajkowski join on stage with DJ Anna Lunoe at 'We Are Your Friends' tour afterparty on August 21, 2015 in San Francisco, California.  (Photo by Miikka Skaffari/Getty Images)