A former employee of rap mogul P Diddy has filed a $21million lawsuit against the star, alleging he's owed unpaid royalties from the late Notorious B.I.G.

According to James Sabatino – currently in jail, and who used to work for Diddy's Bad Boy Entertainment Inc. company – he deserves a stake in B.I.G.'s cash.

Sabatino said he accompanied the "Juicy" star to Miami for a show and recording session and had a verbal contract with the late rapper, promising him money in return for travel expenses and studio time.

B.I.G – real name Christopher Wallace – recorded 17 minutes of music and 90 minutes of video – and now Sabatino wants his cut, stating the material belongs to him.

P Diddy is yet to respond.