Break out the pink!

Robert Downey Jr. and wife Susan are expecting a baby girl, the actor happily announced on his Twitter today.

"Yo. Susan. Me. Baby. Girl. November. Scorpio?" he happily tweeted about the exciting news.

The Iron Man star must be thrilled, because he also updated his Facebook page, saying, "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 are already parents to 2-year-old son Exton, and Downey has son Indio, 20, from a previous relationship.