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Katy Perry and her BFF Rihanna rocked the hell outa 100,000 fans last night as they opened the legendary Rock in Rio music festival in Rio de.Before her performance Saturday, Katy tweeted:”I’M READY TO ROCK RIO! 100,000 people tonight! I LOVE YOU BRAZIL… You’ve waited so long for me so tonight I’m gonna give it to you!!!”Apparently, she didn’t disappoint! The California girl delighted the audience’s ears and eyes — treating her fans with hit after hit, while dancing around her trademark candy themed set. Katy even gave herself time for a few costume changes!It’s almost as if she was trying to out-preform the night’s headliner — her pal RiRi!But any competitive vibes were lost on Rihanna, who had nothing but love for her fellow pop princess! After her performance, the S&M singer tweeted:”@katyperry I love you! Had a blast 2nt, missed kickin it witcho CRAY azz”

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