downeySherlockHolmes120611_07_X17WM230.jpgRobert Downey Jr. and his wife Susan are the proud parents of baby boy, Exton Elias.

The little bundle, weighing 7lbs. 5 oz., was born in Hollywood at 7:24am on Tuesday, their rep confirms.

Downey, 46, recently told Jay Leno:

    "I don't wanna be presumptuous," he said. "But I think actually [the pregnancy] has been tougher on me [than Susan!]... Just the hormones on and the mood stuff and the nausea and the whole thing."

Careful, Robert! The Sherlock Holmes actor is also the dad to 18-year-old son, Indio.