Katy Perry has given fans the chance to sample every song from her upcoming new album.

The superstar singer is due to unleash her latest studio effort 'Prism' on October 21 in the UK and October 22 in the US.

The 'Roar' star has now unveiled teaser snippets on iTunes from each of the tracks due to feature on the album.

She previously tweeted: "In just a few hours when the ITUNES store turns you will be able to preview 90 seconds of EACH song on #PRISM Who's ready for the light?!"

'Prism' meanwhile is due to feature the already public tracks 'Dark Horse' and 'By the Grace of God', as well as new cuts like 'Birthday' and 'International Smile'.

It marks the follow-up to Perry's previous effort 'Teenage Dream', which hit shelves in 2010.