Katy Perry

Rhett and Perry come together in this music video for an abstract, cinematic visual interpretation of their duet.

Host Ryan Seacrest will also return for Season 21.

The couple welcomed their first child together.

The old friends revealed their truce in Swift's 'You Need to Calm Down' video.

It was one of the hands-down highlights of the night.

'Kate Middleton won.'

The two pop stars have been locked in a notorious cold war for years.

'Would I have done it if she said, ‘Would you kiss me?’ No, I would have said 'no,'' says aspiring singer Benjamin Glaze.

From Elton John's viewing party to the Vanity Fair shindig, there were many post-show opportunities to celebrate.

Katy, Ryan and the gang are ready to find the next superstar.