1. Katy Perry and pal Rihanna spent the first part of their evening at KÀ by Cirque du Soleil at MGM Grand Resort and Casino.
3. Katy and Rihanna pose with some of the cast members.
Katy Perry’s Vegas Bachelorette Party
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 Katy Perry and pal Rihanna spent the first part of their evening at KÀ by Cirque du Soleil at MGM Grand Resort and Casino. Photo: David Becker/Getty Images for Cirque du Soleil
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Katy Perry’s Vegas Bachelorette Party
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 Soon-to-be bride Katy tries to trade hats with Marylène Hickok from KÀ by Cirque du Soleil. Photo: David Becker/Getty Images for Cirque du Soleil
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Katy Perry’s Vegas Bachelorette Party
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 Katy and Rihanna pose with some of the cast members. Photo: David Becker/Getty Images for Cirque du Soleil
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Katy Perry’s Vegas Bachelorette Party
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 The pop star and famous actor comedian will reportedly tie the knot sometime in October in Hawaii. Photo: David Becker/Getty Images for Cirque du Soleil
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