Britney Spears' producer, J.R. Rotem, has revealed her hip-hop plans and says the mum-of-two's fifth LP is going to be "crazy" and will take the 'Toxic' singer to "the next level", Bang Showbiz reported.

"I can tell you there's some dance stuff, there's some slow, more introspective stuff and some club tracks. She even raps a bit. Talk rap, " Rotem said to MTV.

Rotem - who has previously worked with Destiny's Child and 50 Cent - also says Britney sees music as "a challenge" and always wants to better what she has done before.

"I was blown away to see Britney record in the studio. You hear this finished result that sounds professional, but you don't know how much of it is overproduced, how much of it is edited," Rotem said.

Last week, Britney gave birth to her second son, Sutton Pierce. She already has one son, Sean Preston, with husband Kevin, who is currently trying to launch himself as a rapper.