It's a girl for Robert Downey Jr. and wife Susan

Robert Downey Jr. welcomes his first daughter

Robert Downey Jr.'s wife Susan has given birth to a baby girl.

The newborn - who is yet to be named - adds to the couple's brood of two-a-half-year-old son Exton, as well as Robert's son Indio, 21, from a previous marriage to Deborah Falconer, PEOPLE magazine reports.