According to Malte’s Instagram bio, he is a model from Germany currently living in Sydney.
In a revealing interview earlier this year, Jack came out as gay, admitting that he has been happy and comfortable with his sexuality for several years.
"I came out a couple of years ago," the former child star told The Kyle and Jackie O Show.
"I got to that point where I was happy and accepting who I am and wanted to be able to share that.
"I was really fortunate, so many people have less fortunate situations. Everyone was so chill in my life, it just wasn't a thing, which I think is the best way for it to be."
Although Jack is thankful that his family were fully accepting of the news, he admits he struggled with his sexuality for a long time before finally coming out.
"When I was 14 in the public eye… you get those thoughts, 'Am I gay? Am I not?' You're still working it out and I was still going through puberty," he admitted.
"So yeah I just had to have that time to figure it out. I don't think it was a particular point, it was a journey."
Besides his sexuality, Jack’s evolving appearance has courted much speculation over the past few months.
Earlier this year, the singer opened up to WHO about getting lip fillers after fans started questioning his plump pout.
"Oh yes, a hundred per cent," he said when asked if he’s had injectables.
"I think it’s best to do whatever makes you feel good … That’s the thing with me over the years I’ve been looking for my identity. I’ve been trying to find myself again and I’ve definitely experimented with filler and whatever, and there’s no denying that. I think it’s pretty obvious."