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Mila Kunis, Ashton Kutcher

Elder Ordonez/INFphoto.com

If for some reason you think the sparks were flying between Ashton Kutcher and Mila Kunis when they were on That '70s Show, think again.

"Of course they played boyfriend and girlfriend, but they had completely separate lives," Kurtwood Smith, who played Red on the show, told me at last night's premiere of his new movie Hitchcock at the AFI Fest presented by Audi.

"You have to remember Mila was a kid," he said. "That was awkward for Ashton at the beginning. He was like 19 and she was like 14 or 15."

Fast forward to today—Kutcher is 34 and Kunis is 29. They were first linked in April, about five months after Kutcher and Demi Moore ended their marriage.

"It's amazing," Smith said of the blossoming relationship. "They're both great people, so I'm happy for them."

Perhaps the romance will spark at reunion show of the hit Fox series, which ended in 2006.

"Maybe they should get married," Smith laughed. "We'll all go to the wedding and that could be the reunion. It'll be a reality show."