Katy Perry's new album 'Prism' drops tomorrow, but she's giving fans a sneak peek - and a free listen! - today only!

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All 16 new tracks, including mega-hit 'Roar,' are streaming on Katy's website.

My faves are 'Walking on Air,' 'Legendary Lovers,' 'It Takes Two,' and 'This Moment.' There's a solid mix of dance tracks, ballads, and straight up hits.

There's no question that when it comes to pop music, Katy knows what she's doing.

Check it out now, it's only streaming until midnight!

What do you think of Katy's new album? Tell us in the comment section below!