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Katy Perry (wearing Vivienne Westwood).2011 American Music Awards - Arrivals held at Nokia Theatre LA Live, Los Angeles, California, USA..November 20th, 2011.ama amas ama's full length white Chinese sequins sequined draped dress strapless writing print blue peep toe snakeskin shoes hand on hip cleavage.CAP/ADM/BP.©Byron Purvis/AdMedia/Capital Pictures.