"You can probably see from my insta that i never really smile, I just pout and look moody lol (i’ll still be doing that x).
"I love my smile so much all I've done since I left the clinic is smile at ppl on the street and look like a crazy person! Ahhh so happy."
Jack spoke recently to Who magazine in May about his experience getting lip fillers when fans noticed that his pout was extra plump.
“Oh yes, a hundred per cent,” he said, when he was asked about them.
"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.”
Despite the injectables, Jack denied any other plastic surgery.
“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.”
Speaking to Daily Mail Australia, Rodrigo Alves said, "I don't encourage him to have any sort of injectables done."
Rodrigo contracted a deadly infection in 2014 from his surgeries that nearly killed him.
WATCH: How much the 'Human Ken Doll' has spent on his 51 plastic surgery procedures
"Jack is talented and naturally good looking. My advice to him is to not get anything else injected because it will not enhance his natural features," he continued.
"It'll make his face puffy and have that 'pillow effect', speaking from my own experience. My advice to him is that he should concentrate on his music career and be happy."
Rodrigo warns Jack that the cosmetic changes may affect his music career if he continues down this path.
"He is a singer and should be known for his talents and not deviate the attention from this to his appearance," he said.
"It may change the dynamics of what he is trying to do - which is to sing."