The photos depict Lizzie aged around 24 as well as a couple from her teenage years.
"Baby liza!!!!! 13.... i think?" the MAFS bride captioned one snap of her younger, blonde self smiling sweetly at the camera.
In another, a presumably teenage Lizzie smiles for the camera holding a cat.
Last week, Lizzie debuted a surprise new look with fans with some remarking that she looked a lot like a certain pop star.
“Ariana Grande vibes,” one fan wrote.
“This look is everything,” penned another.
The new look came a month after Lizzie revealed that she and her MAFS husband Seb Guilhaus had broken up after over a year of dating.
Lizzie and Seb met at the altar when they were matched by the experts for season seven. The Newcastle-based reality star had previously starred on season six when she was married to Sam Ball.
In a heartbreaking post shared earlier this month, Lizzie revealed that the break up with Seb had taken its toll on her emotionally.
"If I could express the pain I have been in lately in words I would," she wrote.
"I have had such amazing people come take me out and bring a smile to my face, the people who have made me laugh and shared their stories and what they have, or still currently, going through."
She added: "I've cried so much lately. Even randomly when keeping busy. I’m trying to take care of myself but omg this is hard. Last Tuesday I had to be in Sydney and I packed everything and even sat in the car but freaked out and went back inside.
"Some moments I can manage and you might not even know how sad I’am. To all the people I have constantly messaged lately asking for advice or just letting me express oh you have no idea how much I thank you for that. I know I’m a broken record and annoying but omg the biggest thank you! Life is a b**** sometimes!!"