Katy Perry

That's a *lot* of pop hits.

A source claims the pop star believes the show is affecting her legacy.

"She's the queen of country and she's glam!"

The 90s rocker hit all the right notes while filling in for Katy Perry on Sunday's episode.

Little Prince Louis is the new "meme king."

See how the pop star reacted to all the memes.

The Coronation Concert is scheduled for May 7.

"Whoa, hostility!"

Northie had her very own "Waking Up in Vegas" moment.

It's giving 'ANTM.'

"I think that mom shaming is super lame."

"This is not okay. You should be singing here because you love music."

She's not a "Watermelon Sugar" fan.

"It was just a blonde girl and I was like, 'Meh, boring.'"

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

Gaga? Katy? Britney? Miley?

Katy Perry was recently performing at her residency in Las Vegas when fans noticed that one of her eyes shut and had trouble re-opening it.

Some of these artists regret their biggest hits.

Katy celebrates a special solar event with her surprise release.

The couple welcomed their first child together.