Though Joshua isn't Kelley and Heigl's first child -- the two are already parents to adopted daughters Naleigh, 8, and Adalaide, 4 -- they definitely can't get enough of their newborn son… and Heigl is already ready for more!
ET caught up with the Doubt star last week, where she gushed about adding to her family.
"I think once you have two, it doesn’t matter anymore!" she laughed. "I've already tried to have this conversation, but it's so funny -- at eight weeks, [Kelley is] like, 'I'm not talking about this right now!'"