(CNN) A sequel to "The Bodyguard," starring Princess Diana? It almost happened, says the person who would have been her co-star, Kevin Costner.

Costner had a phone conversation with Diana about the role, he told PeopleTV's "Couch Surfing."

"I just remember her being incredibly sweet on the phone, and she asked the question, she goes, 'Are we going to have, like, a kissing scene?' She said it in a very respectful way," Costner, the Oscar-winning actor and director, said. "She was nervous because her life was very governed. And I said, 'Yeah, there's going to be a little bit of that, but we can make that OK, too.'"

The script came a day before she died

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