Justin Bieber's mother is 'genuinely concerned' for her son.

Pattie Mallette is standing by the 'Baby' hitmaker after his recent bad behaviour - including being arrested for driving under the influence (DUI), driving with a suspended license and resisting arrest, and allegedly being abusive to flight staff who asked him to stop smoking marijuana - but is finding it difficult to cope in the public eye.

A source close to Pattie told E! News: ''As any mom of an adult child, Pattie is holding him close and talking to him about everything, but she can't make his decisions for him.

''As any caring mother would be, Pattie is genuinely concerned for Justin, and she has said in many interviews before that she doesn't have her head in the clouds and keeps in very close touch.

''She talks with him almost every day, which is likely more than any mom and a 19-year-old son ... and she is in the public eye dealing with all of this.''

The source insists Justin isn't the only one going through a tough time and says Pattie has found it hard being accused of letting her son get away with his recent antics.

They said: ''It's so hard to see people's opinions and accusations when they don't know her.

''If she is with Justin, she is accused of endorsing or enabling him, yet if they find out she is not with him, they accuse her for not being with her own child in a time like this.''

The insider said Pattie would ''never do anything to bring harm to Justin'' and claims the pair have a great relationship but they have had ''serious discussions'' following his arrest and she never makes excuses for her famous son.

The source added: ''Those close to her know from Pattie, that it's always challenging as a parent to raise your child in the way you know to be right, letting them grow as they need when they become adults and have strangers share their opinion in unfounded, often hateful ways.

''It would be hard to imagine that any parent wouldn't feel the same love, concern and responsibility as Pattie does in regard to her son's well-being. Pattie and [his dad] Jeremy both know that they are responsible before God and are focusing on their son's well-being in private.''