Elle and Dakota Fanning, Maggie and Jake Gyllenhaal, Suki and Immy Waterhouse were among those in Utah for the film fest and Respect Rally.
He is to start at the French house on Feb. 1 and show his first collection next September.
The party also attracted Sterling K. Brown, Willem Dafoe, Hong Chau, Brittany Snow, Sophia Bush, Erika Christensen and Sarah Hyland.
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