katy perry

The 2013 American Music Awards were rife with amazing performances from Katy Perry, Ariana Grande, One Direction, Rihanna, Miley Cyrus, Justin Timberlake, Christina Aguilera, Pitbull featuring Kesha and more. And you can catch them all here!

For the 2013 American Music Awards, our favorite stars dressed to the nines. While some singers, like Ariana Grande, opted to go ultra-glam, others, like Katy Perry, had fun with the red carpet. (We're still obsessing over her book clutch.) Check out the photos of this year's best dressed celebs.

The elements factor into Katy Perry's 'Unconditionally' video. It looks like a period clip, mixed with some modern flourishes, like, you know, cars.

Katy Perry's video for 'Unconditionally' is going to be epic! It explores topics like living life and loving without condition. We know that from the 42-second preview the singer shared.

The 2013 EMAs, held in Amsterdam today (Nov. 10), saw celebs in a variety of different outfits. There were more cute, edgy dresses than there were fancy, couture gowns, since it's a fun, less formal event. The stars dressed accordingly and they all looked faboosh in their own, unique way.

So much for letting the light in! Katy Perry's chart-topping album 'Prism' has been labeled a biohazard in Australia.

Katy Perry and Niall Horan are engaged ... but in an Instagram photo only!

Get your Kleenex ready. A terminally ill teenage girl sang 'Roar' by Katy Perry, it went viral, and, well, yeah. It's heartbreaking and inspiring at the same time. 16-year-old Olivia Wise, suffering from an inoperable brain tumor, belted out the tune, and her loved ones made her Internet famous for it.

Congrats to Katy Perry, as her new album 'Prism' debuted at No. 1 on the Billboard Top 200.

Katy Perry, apparently forgetting her rise to fame involved talk of kissing girls and shooting whipped cream out of her bra, is taking other pop stars to task for nudity. Is she shading her BFF Rihanna or her Billboard competition Miley Cyrus?

It was an all-star jam at Katy Perry's We Can Survive charity show in Los Angeles last night (Oct. 23). The singer invited her guests -- Tegan + Sara, Ellie Goulding, Sara Bareilles and Kacey Musgraves -- to join her. They all sang along on the the epic, anthemic chorus and did their thing on the verses!

Patients and care givers at the Children's Hospital at Dartmouth-Hitchcock perform to Katy Perry's 'Roar'.  This is a moving powerful video.  I guess I should warn you that you should probably grab the Kleenex.