Katy Perry ask fans to chose her next single

Katy Perry has teamed up with Pepsi, the sponsor of the VMA, and MTV to reveal details of her new album. The objective of the partnership is to make the fans tweet the hashtag "# KatyNow" to be released the titles and lyrics of two brand new songs that will feature on the album "Prism".

At the end of all items unlocked, fans will vote between the two songs from the singer, the title track accompanied by the hashtag "# KatyNow". The winning song will be revealed before her performance at the VMA and then will be released as a single on September 17, 2013.

So far fans have managed to unlock the title of two songs. They are "Dark Horse" and "Walking on Air".

Remember that the singer takes the stage at the VMA on Sunday (25) to perform the single "Roar", the first single from her new album "Prism", which is scheduled for release on October 22.