Dakota Johnson Reacts to Charlie Hunnam Leaving 'Fifty Shades of Grey': 'Whoops!'

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Dakota Johnson recalls the "confusing moment" when the first Christian Grey, Sons of Anarchy star Charlie Hunnam, decided to bail out of Fifty Shades of Grey.

As Late Show host David Letterman points out, the actor is probably kicking himself now that the erotic book-turned-movie made a "quarter of a billion dollars" in its first weekend at the box office.

"I think it was [that] his schedule conflicted," Johnson tells Letterman when asked why Hunnam decided not to do the film. "He was ...busy."

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Fifty Shades of Grey
, which ended up starring Jamie Dornan, made over $250 million in its opening weekend, a success Johnson -- who plays leading lady Anastasia Steele -- doesn't think Hunnam expected when he backed out of the movie.

"I don't think he knew that was gonna happen," the 25-year-old actress quips. "Whoops!"

She adds of her current co-star, "I think it turned out okay."

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Johnson confirms that they're planning for Fifty Shades of Grey sequels, which gave Letterman an idea. "They should bring back the first guy for the second film," the Late Show host suggests. "I bet his schedule has opened up now!"

The Fifty Shades of Grey talk doesn't stop there. In fact, Johnson makes Letterman blush! The actress tells the host that her mom, Melanie Griffith, instructed her to tell him that she loves him. "She really meant it!" Johnson muses.

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"I know," he responds. "And here's something I will tell you. Your mom used to come on the show all the time, and I really loved your mom."

That's when things get awkward. "She brought you handcuffs one time," Johnson says with a smile. "Yep. ...So, are you my dad?"

Sharing a laugh, Johnson quickly clarifies that she knows her dad is Don Johnson.

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