The musician is rumoured to be dating Dornan's co-star Dakota Johnson.
The 72-year-old actor ran into Martin at Ellen DeGeneres' star-studded 60th birthday party and could not stop gushing about him when she appeared on the NBC talk show.
"I'm gonna talk about Chris Martin. He was with Dakota, right - they're a couple. Got it? 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," Keaton told the audience.
"That's the other problem - I didn't know who he was. But, I saw him and I noticed that he was gorgeous," she said.
When asked about Dornan, Keaton called the actor a "very nice looking man".
"He's kind of scary, too, because of what he does to the girl - the Dakota girl," Keaton added, referencing his BDSM-inclined character, Christian Grey in the film.
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