'Iron Man' Star Robert Downey Jr. and Wife Expecting a Baby Girl

This will be the couple's second child together.

— -- "Iron Man" star Robert Downey Jr. and his wife Susan are expecting a baby girl.

The actor, 49, tweeted the news today.

"Yo. Susan. Me. Baby. Girl. November. Scorpio?" the actor posted.

Read: Robert Downey Jr.'s Son Indio Arrested for Cocaine Possession: Police

The baby is due in November.

Downey Jr. and his wife married in 2005, and together they are parents to son Exton, 2. Downey Jr.'s son Indio, 20, is from a previous relationship.