Leo says he's just a mammy's boy

Leonardo di Caprio fears he's a difficult person to date because his mother is the benchmark by which he measures all women - and "no woman could ever compete with her".

The Titanic star, who is dating Brazilian model Gisele Bundchen, admits his German-born mother Irmelin has all the qualities he looks for in a partner, but he accepts it's a difficult standard for other women to live up to.