Katy Perry, Emma Stone

John Shearer/WireImage; Frederick M. Brown/Getty Images

Oh dear, what a difference between the best and worst dressed stars of last week!

Katy Perry attended the launch of her new eyelash line a in blue colorblock Roland Mouret dress, blue bow heels and her blue hair. But obviously no one else is as big a fan of all blue as she is—the California Gurl singer easily earned worst dressed.

Meanwhile, it's no surprise that Emma Stone nabbed best dressed in her adorable white Elie Saab couture frock and nude accessories at the Essence Black Women in Hollywood luncheon. Congrats, hon!

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