
The actor appears alongside Dakota Johnson in the franchise; the final part of which – Fifty Shades Freed – came out earlier this month.
Keaton has quipped that watching the BDSM-based moments in the movies gave the star an intimidating edge when she crossed paths with him in real life.
She said during an NBC TV appearance that “he’s a very nice looking man”.
“He’s kind of scary, too,” she added,” because of what he does to the girl – the Dakota girl.”
Johnson’s real life partner, Chris Martin, also seemed to catch her eye, when they crossed paths at Ellen DeGeneres’s 60th birthday party.

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“I’m gonna talk about Chris Martin. He was with Dakota, right – they’re a couple. Got it?” she said.
“So, what I’m saying is – he’s gorgeous. That face got better with time.
“He was wearing a hat like this – oh, it was to die for.”
Fifty Shades Freed performed reasonably well at the box office; winning its opening weekend but quickly slipping upon the release of Black Panther.
It received a mauling from critics, even more so than its maligned predecessors in the trilogy.
Fifty Shades Freed is out now.