The procedure involves a Hyaluronidase injection, which will shrink the lips over a few days.
In the Instagram video before the procedure, she also told fans she would be getting a few more tweaks but didn't elaborate
"A few more little things happening, but you're going to have to wait," she said.
During her TV debut earlier this year, Jess was mocked for her plump pout.
One troll described her as having a "Daffy Duck mouth" and claimed it affected her speech.
"Throughout MAFS I have been bullied, trolled and just put down about my teeth post veneers," Jess explained in the new post. "And it was really horrible actually.
"There's always picking on something, but I think when people get veneers or get something done to their face it's because they're unhappy with how they felt in the first place about it.
"So, good on you guys for pointing that out," she said laughing.
