Robert Downey Jr. and Susan Downey have named their daughter Avri Roel Downey.

The couple have a two-year-old son Exton and Robert has already joked that he's inherited ''a variety of Susan's traits'' instead of his own ''junk DNA''.

The 49-year-old actor shared the news on Facebook, writing: ''Yep...Avri Roel Downey joined the party at 3:22 a.m. on November 4th...she's 7lbs even, spans 20 inches, and is accompanied by a variety of Susan's traits that have seemingly overwritten my 'junk DNA.'

''I'll post pics here and there when I'm not too busy staring...''

What's more, the 'Iron Man' star - who also has a 21-year-old son, Indio, from a previous marriage - revealed he can't stop taking pictures of the latest addition to his family.

Robert wrote: ''After 9 months of intensive development, Team Downey is pleased to announce our 2014 fall/winter project.

''Principal photography commenced 11-14 and will continue until she says, 'Dad! You are embarrassing me...I'm 30, this has gotta stop.' ''

Prior to the birth, however, Robert admitted to being anxious about the prospect of raising a girl.

He explained: ''I've never had a daughter before, so I don't know what really prepares a dad. I'm asking around. But I did my part and now I'm just going to show up and do what I'm told.''