Katy Perry & Taylor Swift

This list wouldn’t be complete without Katy Perry and Taylor Swift’s highly publicized feud, which started in 2014 after the country singer-turned-pop star accused someone of stealing her dancers in her tour. Then, the blonde singer revealed that Bad Blood is about another hitmaker, which prompted the California native to unleash a very telling tweet.

In 2018, however, Perry sent an actual olive branch, which signifies peace, to Swift, who, in turn, sent cookies. To prove they have mended their friendship, the 36-year-old appeared in the music video of You Need to Calm Down. In 2020, the Grammy winner sent a baby gift to the new mom.