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Blake Lively was excited to see Jimmy Fallon on The Tonight Show Tuesday. "I haven't left my house in like four months. This is very different. I have this on record, though. Every time I get up in the morning," said the Age of Adaline star, who welcomed daughter James Reynolds with Ryan Reynolds in December.

"Is that what you watch with the baby?" Jimmy asked.

"No, I make sure everyone's clapping and cheering for me," Blake joked.

Jimmy then asked how James is doing. "She's the best!" she told him. That being said, Blake and Ryan are "already paranoid" about how fast she's growing up.

"We turned our basement into this cool, accessible room," she said. "I said to Ryan, 'You know, we need to put in a window.' And he said, 'A window going down into the basement? That doesn't make any sense.' I said, 'It's a chastity window. You knew. You were a teenage boy. We cannot have our child—a daughter—go in the basement with a boyfriend. We need a window so that they know at all times that we are watching and they can't get away with doing anything terrible.'"

"It's the new form of contraception. We're already planning for that, and terrified!"

Blake Lively, Tonight Show, Jimmy Fallon

Douglas Gorenstein/NBC

There are more pressing matters that need to be addressed, of course.

"We're total rivals, by the way," Blake, 27, said of Ryan, 28. "I hear all the time, 'da-da, da-da,' and then I walk in the room and he's like, 'ma-ma.' And I'm like, 'How dare you do that?' But all day! I'm like, 'How dare you do that?' The word 'da-da' is banned in our house. You have to say ma-ma all day. And I'm like, 'How can you do that?' I'll take videos where I'm saying 'da-da,' but I don't say it ever."

"She has to say mama first!" she said. "I do everything! He does nothing!"

To learn more about The Age of Adaline, watch the video below.

(E! and NBC are both members of the NBCUniversal family.)