Katy Vs. Ashlee: Who Wore It Better???

Left: Fairy nymph Katy Perry at the 29th Annual ASCAP Pop Music Awards back in April. Right: Ashlee Simpson at the HBO Emmys after party on Sunday.
Both songstresses are wearing the same Temperley London gown, but we want to know…
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[Image via Adriana M Barraza/WENN & AP Images.]