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Young Hollywood celebrated Mary-Kate and Ashley Olsen‘s Elizabeth and James Textile line at the Beverly Hills Hotel last night. “I had so much fun tonight,” stylist Brad Goreski Tweeted after mingling with the designing duo and fellow guests Emma Roberts, Nicole Richie and Dakota Fanning. Russell Brand also took to Twitter, making good on his promise to smuggle a few of his “well dressed” followers into the New York City premiere of Arthur, where they got a glimpse at the actor’s beautiful co-stars, Jennifer Garner and Helen Mirren. See more photos from last night’s hottest parties in the gallery.