Justin Bieber says that he found reading his mother's memoir "tough".
In Pattie Mallette's autobiography Nowhere But Up she details how she was sexually abused, took drugs and attempted suicide before becoming pregnant. The book also describes how she split from the pop singers father, Jeremy Bieber, at the age of 18.
However, although 18 year-old Bieber said reading the book was difficult, he is supportive of her decision to write it.
He told Macleans.ca: "It was a lot for me to hear. But I'm older now. When I was younger, my mum never told me any of this stuff. It was definitely hard reading those stories, but I'm supportive of her writing the book. It's cool."
Mallette's mother Diane and step-father Bruce Dale admitted they were also shocked by some of the incidents in the book as they were unaware of Bieber found reading mother's memoir 'tough'many of her difficulties.
Dale said: "There are three sides to every story. There's one side, the other side, and then there's the truth."
Meanwhile, As Long As You Love Me singer Bieber is determined to be more than just a "teen heartthrob" and says his competitive nature will help to keep him at the top.
He explained: "I don't just want to be a teen heartthrob. Now I'm at the top, there's only one way to go and it's down. That gives me the motivation to stay on top and keep pushing.
"I grew up with a really competitive side, playing sports-basketball, hockey and soccer. I don't want to be second-best, third-best, fourth-best. I want to be the best. That takes a lot of dedication and hard work. You got to have plans."