Robert Downey Jr. is going to become a father once again.

The Hollywood star and his wife of nearly nine years, Susan, are expecting a baby daughter together.

Downey announced the exciting news via Twitter on Wednesday (July 9th), in a post addressed to his longtime love.

"Yo. Susan. Me. Baby. Girl. November. Scorpio?" he tweeted.

The elated 49 year-old also took to Facebook to send a personal message to all his fans.

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

The happy couple are already parents to a 2 year-old son, Exton Elias, who was born on February 7th 2012, and Downey is a father to 20 year-old son, Indio, from his first marriage to actress/singer Deborah Falconer.

A couple of months after Exton was born, the Oscar-nominee talked about being a father for the second time to Esquire, noting that it is still a daunting thought.

"Am I going to know what to do with them? Does any new parent, even if you're not a first-time parent, ever really know what to do?" he said. "Only thing you have to do, the only requirement, if you can hack it, is to not transfer your own discomfort in the moment to this fresh soul, right?"

More: Robert Downey, Jr. Developing Rehab TV Drama

However, only a few weeks ago, his other son, Indio, made the news for after getting arrested for cocaine possession in West Hollywood, California, where he was also spotted smoking a pipe. Downey, who has had his own experience with drug abuse, issued a statement on the matter, showing support and understanding for his eldest. 

More: Robert Downey Jr.'s son used drugs from age 12

"Unfortunately there's a genetic component to addiction and Indio has likely inherited it," he said. "Also, there is a lot of family support and understanding, and we're all determined to rally behind him and help him become the man he's capable of being."

The 'Iron Man' actor's reps have also confirmed the pregnancy news, congratulations!

Robert Downey Jr
Downey Jr. and his wife, Susan, are expecting a baby girl