Is Bieber dating both Katherine Gazda, Chantel Jeffries?

Pop star Justin Bieber is reportedly romancing both singer Katherine Gazda and model Chantel Jeffries.

Bieber, 19, and Gazda, 18, were introduced at the end of 2013 by mutual friend Blake Kelly and the latter has confessed to her friends that she wants to have his children, reports mirror.co.uk.

"They hit it off straight away and are both really serious about one another. But their relationship has been very up and down because she can't stand the way he has been behaving recently. She is desperately trying to help him through all the scandal and regain his clean-cut image," said a source.

"Underneath all the bravado and controversy, Katherine believes he's a lovely kid with a real heart, she just thinks he is being led astray," the source added.

But the big stumbling block is Bieber's relationship with Jeffries, who was with him on the night he was arrested for driving under the influence of drugs and alcohol.

His family fears that 20-year-old Jeffries, who has a criminal record, is a bad influence, while Gazda simply wants him to stay away from her.