MEGAN Fox is disappearing before our eyes.

Sources say the actress — who’s married to actor Brian Austin Green — has the same waist size as her eight-year-old stepson Kassius after she put herself on an extremely strict 1,000 calorie-a-day diet.

Megan apparently weighs just 7st 4lb.“She’s wearing tiny jeans,” a Megan insider told Britain’s Now magazine.

“Meg might like the way her body looks, but her legs are too thin and she won’t listen to anyone who tries to tell her to put on weight.

“She’s happy with the way she looks and says she’s eating balanced meals.

“Megan loves sushi. She’s not eating anything bad — just not eating enough.”

This isn’t the first time Megan’s weight has been a talking point.