Robert Downey Jr is set to be a dad again.

The Iron Man star, 49, and his film producer wife Susan, 40, are expecting a baby girl in November.

Robert tweeted the news, writing: "Yo. Susan. Me. Baby. Girl. November. Scorpio?"

And on Facebook he wrote, "Um. I don't know if it's a 'man's world', but I'm certain women run it. Susan and I are therefore delighted to announce we are expecting a baby. Girl. November. rdj"

The Avengers star and his wife married in 2005 and the actor credits his wife with helping him kick his drug and alcohol addictions.

They are already parents to son Exton, two, while the star has a son Indio Falconer Downey, 20, from his previous marriage.

Last month, Indio was released on bail after being taken into custody with what deputies believe was cocaine. A court date is set for August 29.