From Christina Aguilera and Demi Lovato’s tight-knit friendship to Elton John and Eminem’s long-standing friendship, how well do you know these celeb besties? Try our quiz below!

1. How many collaborations have Ed Sheeran and Taylor Swift released?
2. Lady Gaga collaborated with Ariana Grande on which track...?
3. What's Adam Levine and Blake Shelton's 'ship' name?
4. What TV show did Adam Levine and Blake Shelton first become friends on?
5. Ellie Goulding was the opening act for the North American leg of which Katy Perry tour...?
6. Demi Lovato and Christina Aguilera collaborated on which track...?
7. What year did Elton John first meet Eminem?


SEE ALSO: Our Fave Celebrity Friendships


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