At first, the proud father held back on showing the photos, saying, "I would get in huge trouble. I have to exercise just a little restraint. I'm sorry. I mean… if you want me to, I will."
After the first photo appeared on the screen, Robert exclaimed, "He's so darn cute, isn't he? You get one, that's it. Unless of course you want to see the other one."
The second photo then appeared picturing the newborn with orange pants and a striped jacket. Adorable!
The "Iron Man" star also has an 18-year-old son, Indio, from a previous marriage.
"Avengers" star Robert Downey Jr. revealed the first photos of his 8-week-old baby boy, Exton Elias, his first child with producer wife Susan, on "The Tonight Show with Jay Leno" Thursday.