Justin Bieber Disses Austin Mahone For Copying His Hairstyle - Austin Gives A Nice Reply. Justin Bieber and Austin Mahone have taken to social network to share a few wisecracks aimed at one another.br br The 18-year-old pop star, who has previously been dubbed 'the next Justin Bieber', took to his Instagram to show off his new hairstyle in a selfie on Saturday night.br br Austin captioned the photo showing off his new hairstyle to his 5.8m followers: 'Just got my hair did.'br br Shortly after the post, the now 21-year-old badboy couldn't resist putting his two cents in on the due as he commented: 'I wonder where u got that hair idea.'br br Justin made sure the younger singer knew it was just a rib as he followed it up by writing: 'All jokes aside you look handsome.'br br It did not seem like the Mmm Yeah hitmaker's took it too lightly as he posted a side-by-side comparison of one of his old haircuts to Justin's new longer locks.br br He posted the two image post with the message: '@justinbieber lol it's all good bro. Your new look kind of looks like my old one though.