The photographer also took shots of Clooney and his girlfriend Elisabetta Canalis enjoying private moments in the yard of his estate.
The photos were published in two magazines -- and in a statement to TMZ, Clooney says he's gunning to sue both the mags and the photog who took the pictures.
"We're suing two magazines AND a photographer. I don't know about the law in the United States but in Italy it's illegal for photographers to climb over my wall and to take long lens pictures of a 13-year-old girl in her bedroom.
I draw the line of privacy at that."