Mum's the word for Justin Bieber

Pop star Justin Bieber's mum has inked a book deal to tell the story of the role she played in her son's rise to superstardom.

Pattie Mallette signed a deal with Revell Books to publish, Nowhere But Up: The Story of Justin Bieber's Mom.

The book's publisher said in a statement on Tuesday that Mallette will share details of the trauma, abuse and addiction that plagued her early childhood and young adult years, leading to a suicide attempt when she was 17.

The Stratford, Ontario, native became pregnant at age 18 and gave birth to Bieber in 1994.

The book, written in collaboration with A.J. Gregory, will include a foreward by Bieber. It is slated for release on September 18.

Meanwhile, Bieber has spent $10.8 million (Dh39 million) on a mansion in the Hollywood Hills, which he plans to share with girlfriend Selena Gomez.

Bieber, who turned 18 last week, has treated himself to the lavish five-bedroom, 9,400-square-feet home overlooking Lake Hollywood.

He has also been presented a luxury 2012 Fisker Karma electric car worth $100,000 by his manager Scooter Braun, femalefirst.co.uk reported.

"You work really, really hard. I always yell at you don't get anything flashy. You know, we're not about that. Be humble, be humble and I kind of broke my own rule," Braun said.