The couple met Fox, 23, in a Starbucks in West Hollywood last week.
Not wanting to let the opportunity pass him by - (and what a great one to brag to the lads about) the boyfriend approached Fox and told her she was "beautiful."
His jealous girlfriend stood by in the background and was furious.
The boyfriend said "You are definitely the most gorgeous woman on earth. You're a perfect 10! I've never seen anyone more beautiful than you.'
According to reports Fox ignored her stalker but he persisted.
"You're beautiful, you really are," he continued.
Meanwhile his girlfriend had a puss on her that could knock a wall.
Not taking any more of it, the girlfriend stomped over and said, "Why don't you just stand on top of her, you're so close. By the way, you're not so perfect! Why don't you admit it - you've had a nose job and a boob job, no doubt. Is that right?"
Fox left the store pretty quickly and on her way out said, "I just came here to get a cup of coffee. This is so not worth it!"