Katy Perry's highly-anticipated third studio album Prism is out worldwide on October 22nd, but a few days before it officially drops, it's available to stream off the pop star's website. With the hot single "Roar" burning up the charts, and the second confirmed single "Unconditionally" sure to follow suit, Prism is gearing up to be one of 2013's biggest pop records. Starting off with "Roar", the album then goes into "Legendary Lovers", which is already a fan favorite online. It's followed by the ultimate party song,"Birthday", which launches into the early-90's dance tune "Walking On Air". Fans are loving Katy's already-leaked "Dark Horse", featuring rapper Juicy J, and were also curious to hear the songs written about Perry's divorce with Russell Brand, "Ghost" and "By The Grace Of God". The album rounds out with the funky girl anthem "This Is How We Do", an ode to a free female in "International Smile", the self-loving "Love Me", and then anthemic closers "This Moment" and "Double Rainbow". Overall, the album is being very received by listeners, and it's only a matter of weeks to see how many copies Perry will sell. Maybe she'll be bigger than Miley's Bangerz?