Robert Downey Jr. held hands with his pregnant wife, producer Susan Downey, on the set of The Avengers today in NYC. It was just a few days ago that the pair announced they are expecting their first child together; Robert also has a 17-year-old son, Indio, with his former wife Deborah Falconer. Susan joined RDJ at work with his cast of superheroes, including Scarlett Johansson, Chris Evans, Chris Hemsworth, Mark Ruffalo, Tom Hiddleston, and Jeremy Renner, as they shot new scenes at Bethesda Fountain in Central Park this afternoon. The Marvel production has filmed in several states over the Summer, and the cast has clearly built a camaraderie — today, they visibly cracked each other up during lulls in the action. Fans got a sneak peek at The Avengers last month during Disney's D23 expo, where we talked with RDJ and Scarlett backstage, and the crowd's response was overwhelmingly positive. Robert told us he was excited about the reaction to the early clips of the film, which hits theaters next May.