50 Cent is doubling down on trolling friend-turned-foe, boxer Floyd Mayweather, while promoting his new book.
The rapper has been mocking Mayweather for around a decade, accusing him of being illiterate.
50 Cent, whose real name is Curtis James Jackson III, is promoting his upcoming fiction novel The Accomplice.
"I have no beef with anyone, I even made sure the audiobook comes out at the same time so champ [Mayweather] won't feel left out," he wrote on Instagram alongside an image of the book.
He also teased an upcoming movie "coming soon".
The pair have been feuding online for years, including in 2014 when the 'In Da Club' singer offered to donate US$750,000 to whatever charity Mayweather picks if he could read one page of the Harry Potter book series.
He later downgraded this to reading from The Cat in the Hat.
