Robert Downey Jr. Expecting Third Child

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UPDATED: The "Iron Man" actor announced the news on Twitter in idiosyncratic fashion.

Robert Downey Jr. is about to welcome his first baby girl.

His wife, Susan Downey, is expecting a girl in November, his reps have confirmed to The Hollywood Reporter

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The Avengers star announced the news on Twitter on July 9 with a characteristically casual message: "Yo. Susan. Me. Baby. Girl. November. Scorpio?"

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

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This will be the couple's second child together, joining two-year-old son Exton Elias Downey. Robert, 49, has a 20-year-old son, Indio, with ex-wife Deborah Falconer.

Indio was arrested June 29 on suspicion of cocaine possession and is due in court Aug. 29. Robert issued a statement after the arrest, saying that Indio had "likely inherited" the addiction and that he hopes his son can be "another recovery success story."

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Downey currently appears in the culinary comedy Chef and stars in the upcoming courtroom drama The Judge, hitting theaters Oct. 10. He will appear in 2015's Avengers: Age of Ultron, which is now filming. 

Twitter: @_RyanGajewski