50 Cent writes the book on bullies

He made it big with songs titled "How to Rob" and "Thug Life." He's had beefs with Ja Rule, Fat Joeand The Game, among others. Now rapper-actor 50 Cent wants to play nice-nice.

Yep, Fitty is in the process of writing "Playground" -- an anti-bullying novel for teens.

The book, which Penguin Young Readers Group says will be published in January, is about a 13-year-old bully who changes for the better after he sees the damage he's inflicted.

"I had a strong desire to write 'Playground' because I wanted to explore how a kid becomes a bully," the Queens native said in a statement. "I drew on events from my own childhood and adolescence but was excited to see the story take on its own life."

50 Cent, whose real name is Curtis Jackson, is no stranger to the published word. He wrote a memoir detailing his rise from dealing drugs to becoming a famous hip-hopper in "From Pieces to Weight." He also co-wrote a tome on success, "The 50th Law."

Bonus: Radio Silence NYC, an anti-bullying quartet, plays The Vibe Lounge in Rockville Centre Aug. 20.