The photos now circulating are screenshots of the originals which were posted to Jack's Instagram story.
Daily Mail also claims that more snaps are circulating that the former Australia's Got Talent star sent to men through Instagram's direct message function.
In one screengrab taken from Jack's story, the singer poses naked with his back to the mirror, covering his posterior with a strategically placed 'FRIDAY' banner.
Another image from Jack's Instagram story shows him posing for a mirror selfie with a female friend.
Jack made headlines when he unveiled a dramatic new look on Nine's singing show.
‘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,' the Sydney-based star said.
‘To me, lip filler is like makeup, it’s like doing your hair ... It’s not permanent. I’ve never had any kind of plastic surgery or anything like that. I think it’s each to their own, whatever makes you happy.
‘It’s such a small thing for me."
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