Online trolls quickly took to the comment section to express their shock at the photo... and its subject matter.
"Read the bible 🙏🏽😔," wrote one fan, while another simply commented with the vomit face emoji.
One social media user questioned how Martha's TV husband Michael Brunelli would feel about his girlfriend posting a close-up of her groin on Instagram.
"@mbrunelli must love these photos you post! Don’t get me wrong you’re Hot AF! But you’re not single? Some respect for him? Or $$$ more important."
Despite fans cries, the primary school teacher from Victoria was seemingly unfazed by his partner's photo, leaving a cheeky comment of his own.
"Suddenly feel like some watermelon 🍉."