Brad Pitt is desperate for a biological son.

The Ocean’s Thirteen actor has reportedly told his lover Angelina Jolie he wants her to get pregnant again as soon as possible.

However, the pair, who already have two adopted children Maddox, five, and 18-month-old Zahara and a biological daughter Shiloh Nouvel, have fallen out because Angelina wants to adopt a child instead.

A source told the New York Post newspaper: “Brad wants another child, preferably a boy, but he wants a biological boy. He is adamant and wants her to get pregnant again right away.”

Angelina also keen to put off getting pregnant because of her hectic work schedule — she is currently involved with at least three films.

Brad’s representative failed to comment.