And now, Jack has finally addressed the rumours.
Speaking to the Daily Telegraph, the Aussie star denied ever having plastic surgery, but admitted to plumping his pout with lip fillers.
“I’ve never had plastic surgery or any surgery, it’s pretty obvious I have had my lips done with fillers,’ he stated.
“The funny thing I see articles and people talking about it and for me it’s not a big deal.
“I think with these types of things it’s so common now, especially for people my age, it’s not a big deal. I see it like when you do your makeup or tattoo, it’s all the same.”
The star also opened up about his attempt to crack the US market. Following his success in Australia, Jack moved to America at 16, however returned Down Under just two years later.
“The pressure that I put on myself got a bit too much and I wasn’t enjoying it anymore and I wasn’t enjoying singing which was a big red flag. What was the point of doing this if I don’t enjoy it,” he said.
“I studied and worked in different jobs like a receptionist, after school care, worked in aged care, retail and a deli, just wanting to sink my teeth into something normal because I had not lived a normal teenage life until this point.”
