Robert Downey Jr and his wife Susan are expecting their second child together.

The actor confirmed the news that they will welcome a baby girl in November on Twitter.

He wrote: "Yo. Susan. Me. Baby. Girl. November. Scorpio?"

The Iron Man star also posted on his official Facebook page: "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 couple, who have been married for almost nine years, are already parents to son Exton Elias, who was born in February 2012.

Downey Jr also has a 20-year-old son Indio from his first marriage.

He will next be seen in the upcoming legal drama The Judge.