Tue, 02 Oct 2012 10:55:46 GMT | By Colleen Last
Famous best friends

Rihanna and Katy Perry

Rihanna and Katy Perry (© Wire Image)
  • Rihanna and Katy Perry, George Clooney and Brad Pitt, Beyoncé and Gwyneth Paltrow (© Wire Image, Getty Images)
  • Brad Pitt and George Clooney (© PictureGroup/Rex Features)
  • Rihanna and Katy Perry (© Wire Image)
  • Ryan Reynolds and Bradley Cooper (© Alex J Berliner/BEI/Rex Features)
  • Zac Efron and Ashley Tisdale (© Wire Image)
  • Matt Damon and Ben Affleck (© Wire Image)
  • Jennifer Garner and Reese Witherspoon (© Wire Image)
  • Salma Hayek and Penelope Cruz (© FRED PROUSER/Newscom/RTR)
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Not many best friends know what it's like to be a chart-topping pop star, but Rihanna and Katy Perry do. The pair speak on the phone constantly, no matter where they are in the world, and have plans to duet together.