Ashton Kutcher and Mila Kunis are expecting their second child, a baby boy, and the actor is actually pretty nervous about becoming a father of two. During an appearance on The Tonight Show Starring Jimmy Fallon on Wednesday, he admitted that things are about to get intense. "I'm worried. The first one, I almost became a doula. I was reading every book. I was ready," he said. "This one, I haven't done anything." He also joked that "it's gymnastics having children" while demonstrating how kids are put into car seats. Ashton then got so animated, he ended up ripping his pants. Yep, this is why he's still one of our biggest Hollywood crushes.