9. Taylor Swift vs. Katy Perry
Taylor Swift and Katy Perry’s public feud ignited in 2014 after a falling-out over backup dancers who switched sides between their tours. Taylor’s Bad Blood was reportedly inspired by the feud, while Katy responded with her diss track, Swish Swish.
Despite the drama, both pop stars hinted at reconciliation in later years. However, the conflict between them remains a prime example of how even the closest of friends can fall out over professional matters.