Katy Perry

From Gwen Stefani to Miley Cyrus and John Mayer, these pop stars have written breakup songs about other famous people.

Gaga? Katy? Britney? Miley?

Some of these artists regret their biggest hits.

Host Ryan Seacrest will also return for Season 21.

This year's holiday was met with a mix of celebratory posts and acts of protest.

Superstar songwriter Bonnie McKee spilled some tea about how Katy Perry inspired her to write this Britney Spears smash.

"She’s amazing and she has these people controlling her money, her life."

Check out cringe-worthy fashion fails from our favorite celebrity couples.

Katy celebrates a special solar event with her surprise release.

"#FamilyFirst," she tweeted.

"Our democracy and freedom are worth waiting for."

“I don’t want to be a part of a trend, I want to be a part of a movement.”