The `Boyfriend` hitmaker`s mother Pattie Mallette gave birth to him when she was just 18 and Justin, who is now 18, says being so close in age has made them best friends.
Speaking on 2Day FM`s Kyle and Jackie O show, he said: "She`s amazing... I was definitely an accident, it`s great my mom is super young, she`s a friend and a mom, she`s always been really strict, she`s still keeps me in line."
Justin also revealed while he has no problem performing in front of thousands of people, he freezes up when he has to speak in public.
He explained: "I love performing, doing tours and having a new crowd every night that`s something I`ve always loved... It`s weird I can perform for a lot of people but as you can probably see in my acceptance speeches, I kind of freeze up and I don`t really know how to speak in front of a lot of people."
Justin also has his sights set on the big screen and has been talking to Mark Wahlberg about starring in a new movie.
He explained: "We`ve been working on this, this Mark Wahlberg movie, it`s a basketball movie...
"We`re still figuring it out, it takes time, with movies it always takes time, it`s just about a waiting game."