Chris Brown has collaborated with Soulja Boy Tell'em.

The shamed rapper has written a song with Grammy nominee Soulja Boy for Brown's forthcoming album and both rappers say the song - entitled 'Bad' - is their best yet.

Soulja Boy said: "My approach to it was, 'if me and Chris Brown ever did a song together, it got to be the best song ever.'

"When people hear it, it got to be automatic - be in all the kids' heads, all the girls definitely got to love it, all the females got to love it.

"I was just thinking, 'What are the slickest lines I could say to a female to make them fall in love with this record?' "

Brown - who in May was sentenced to five years probation for an assault on his ex-girlfriend Rihanna - met Soulja Boy while touring together and said the 19-year-old rapper inspired him to take a new route on his new album.

Brown, 20, said: "He could talk about, 'I got my shoes on, I got my hat on, but I'm fresh though,' and it could be something funny.

"But it's always something that can be catchy for kids, and I wanna do something that's real cool for everybody."