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Watch Blake Lively's cute daughter call Jimmy Fallon 'Dada'

When the "Tonight Show" host wrote "Your Baby's First Word Will Be Dada," he probably didn't think it would come to this.
/ Source: TODAY

Jimmy Fallon is the author of a book called "Your Baby's First Word Will Be Dada." But he probably didn't think he would be the "Dada" in question when it comes to his "Tonight Show" guests!

As Blake Lively revealed on Friday's show, there's been a little mix-up in her household. One-year-old baby James, whose dad is Ryan Reynolds, has become quite enamored with a life-size cutout Fallon gave Lively of himself last time she visited the show.

She hauled the cardboard cutout back to the show this time around (with its lower legs broken off!) and brought a story with it while visiting to promote her new movie "Café Society."

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blake lively on jimmy fallon
Blake Lively and Jimmy Fallon (not the cutout version!)The Tonight Show Starring Jimmy Fallon

"It messed up my home life a little bit," she said. "I brought a home video to share. Prepare yourself — this may be breaking news."

In the video, we see sweet baby James smooch the cardboard cutout. (And check out those curly locks!) But then Lively (off-camera) asks, "Where's your dada?" and James points to the image, crying, "Jimmy!"

Whoops! That's a book that worked maybe a little too well.

Lively then turned to the camera and addressed Fallon's wife directly: "I wanted to take this time ... Nancy, I really love you a lot. But ...."

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Meanwhile, Fallon had other worries, fanning himself with his notes. "Hopefully, Ryan's not watching tonight!"

Here's hoping he appreciates a little Dada-ist humor.

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