George, who has been friends with Nicole since they starred together in 1997's 'The Peacemaker', sent his congratulations to the pregnant actress and joked she will make a fantastic "tall" parent.
He said: "I'm thrilled for her. She will be a perfect mother. Nicole will be great. She'll be a tall mother!"
Nicole, 40, and her country singer husband Keith Urban - who married in June 2006 - confirmed they are expecting their first child together .
Nicole's representative Catherine Olim said: "The couple are thrilled."