The stunning shot swiftly racked up more than 27,500 likes from fans, but early MAFS exit Lauren was a little less impressed.
"Smile gf!! Don't be another duck lips," she commented, finishing the message with a heart.
Straight talking Elizabeth calmly hit back by writing: "Boo, I'm going to do what I feel like doing."
Lauren then conceded: "Fair enough babe, you look stunning either way."
Both girls comments received hundreds of likes from dedicated followers.
Later, Elizabeth took to Instagram to blast public criticism about her weight.
The brunette bombshell revealed she is living with the condition porphyria, a chronic illness connected to the build-up of red blood cell proteins.
She urged fans to be "kinder" to one another and to go easier on themselves when it comes to appearance.
Watch the video below to hear what Elizabeth has to say body positivity: