Britney Spears raps on new album

Britney Spears new material has been declared "crazy ass" by one of her new collaborators.

Producer Sean Garett, who worked with the singer on three tracks, made the claim while explaining that the singer's comeback material will surprise fans.

He said the duo tried to do "some really crazy ass stuff that the world is going to love".

Meanwhile Spears is also working with 50 Cent's producer and musical collaborator Jonathan ‘JR’ Rotem.

He likened one track to Rihanna’s Soft Cell sampling hit ’SOS’, and revealed that she raps on one of their collaborations.

“Not ‘rap’ rap, but talk rap,” Rotem told MTV News.

“With songs like ’Toxic’ she was very innovative, and we’re trying to top it. Push it to the next thing," he added. “How can we make the type of music where the people are gonna go, ‘Woah, what’s that?’.

“There some dance stuff, there’s some slow, more introspective stuff; some club things.”

Although no release date has been confirmed, Spears' next album is expected to be released in early 2007.