Katy Perry

Katy Perry previews snippets of two new songs on Instagram.

Rose McGowan, Leonardo DiCaprio, Susan Sarandon and more also celebrated on social media.

Beyonce and Adele are both likely performing at February's Grammys, according to a producer of the event.

With another producer confirmed for her forthcoming album, Katy's got all the musical ingredients that went into 'Bad Blood' on her side.

'Oh, my God. I have to say I don't think of that ever," Clarkson told Andy Cohen on 'Watch What Happens Live.'

Hey Taylor: Is it too late now to say sorry?

Tony Marrero told Ellen Degeneres he found strength after the tragedy in Perry's 'Rise.'

Spencer Morrill thought he'd been online-dating Perry, but was proven wrong on the MTV series.

The video for Katy Perry's Olympics anthem sees her recovering from a (very high) fall.

A rival cosmetics company claims Perry's logo is too similar to their own.