The pop star apparently wasn't a fan of Chief Keef's new single, "I Hate Being Sober."
Here's what you need to know about five of the biggest and strangest fandoms for female pop stars.
MTV's Video Music Awards were huge on Twitter and Facebook, with stars like Frank Ocean and Katy Perry drawing thousands of comments. Only this year's Grammys saw more social media activity.
Go on and brush your shoulders off, Rihanna. You earned it.
After posting a personal plea on YouTube, Tony Harrison will accompany Katy Perry to the MTV Video Music Awards in September.
20-year-old Tony Harrison has a few months to live, and told YouTube he wants to spend one of his remaining hours hanging out with pop star Katy Perry.