"This photoshoot will never get old. I kept this poster and we hand it up in our guest room whenever someone comes to stay," Matilda joked, insisting that Art was, in fact, wearing underwear in the raunchy picture.
"The rest I can't show you because they are highly unflattering of everyone involved, even though I was stone cold sober," Matilda admitted on her Instagram story.
Other pictures revealed some cute "comical" cookies she and her guests indulged in, and the gorgeous pink dress she wore for the occasion.
We wonder what Art got up to on his stag party!
Last week Matilda, who is expecting her first child with Art, shared an ultrasound of their unborn baby.
"We love you so much already little Green," the mother-to-be wrote alongside the sweet snap.