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Besties Rihanna and Katy Perry have been tearing up Coachella together this week! The pop pair love to party, and that’s just what they did at the Calvin Harris gig, where Rihanna performed on stage with the DJ before crowd surfing her way to her pal in the mosh pit. RiRi, who was sporting some tiny denim hot pants, kept her fans up-to- date all day via Twitter. With the partying continued well into the night, the star tweeted, ‘This turned out to be one of the best nights of my life.’