The 'Never Say Never' hitmaker - who previously worked with the hip-hop star on song 'Next 2 You' - is set to feature on 'Ladies Love Me' on the collection of songs, which includes appearances by Wiz Khalifa, Swizz Beatz and Tyga.
On the track, 17-year-old singer - who appears as his alter-ego Shawty Mane - raps: "Baby I'm your doctor/ I could be your rocker/ swaggin' I'm not bargain'/ but I swear that I could rock ya'/ baby I'm not crazy/ I got swag like Patrick Swayze/ y'know them haters never phase me?that's not how my momma raised me."
Justin tweeted his fans to inform them of his rapping capabilities, write on the social networking website: "did a lil something on the upcoming @chrisbrown mixtape.. Ladies love me. then we got crazy on the @asherroth album. #shawtymane (sic)".