Scarlett Johansson was M.I.A. at Comic-Con in San Diego this weekend, likely due to her pregnancy. As her movie Lucy soared the top of the box office for a $44 million debut, her Avengers: Age of Ultron co-star Robert Downey Jr. spoke to E! News' Kristin Dos Santos about their respective growing families.

Robert recently revealed that he's expecting his second child with his movie producer wife, Susan Downey. "I've never had a daughter before, so I don't know what really prepares a dad. I'm asking around," the star admitted. "But I did my part and now I'm just going to show up and do what I'm told."