The pint-sized actress (she stands just 5'3'' tall) joined forces with Kutcher for forthcoming flick No Strings Attached, and admitted her lack of stature brought them hours of entertainment.
"He's a lot taller than me," Portman told Access Hollywood. "We definitely got a lot of enjoyment out of that, well, he probably got more because he gets to be the tall one ... I get to be the gnome! There were a lot of short people jokes."
The new film will see the pair play two people who agree to have a purely sexual relationship but soon develop feelings for each other.