It all started when he posted a selfie after his brand-new haircut.
Justin responded by accusing him of copying his old hairstyle!
But in the end, he called his new hair "handsome," showing that he's not actually upset about their matching hairdos.
The "MMM Yeah" singer continued the joke, saying that Justin's new hairstyle looks like his old one.
We have to admit, it's kind of funny that they flip-flopped their hairstyles — just as long as they're both okay with it. Obviously, their back-and-forth is one big joke, but we weren't so sure how Austin was going to take it. He's deflected negative attention away from his friend, but he also hates being compared to the singer. It's a good thing he took it well!
Do you think Austin and Justin copy each other's hairstyles? Are they friends? Sound off in the comments!