Actress Helen Mirren, who received a BAFTA Fellowship from Duke of Cambridge, says the royal was very charming and relaxed when they met backstage.
Mirren, who won an Oscar for playing prince William's grandmother Queen Elizabeth, said William was easy going, reported People magazine.
"He was so great backstage - so lovely. He was very easy, very relaxed. I don't mean this rudely, but you would never think that he was a prince, which to me is the biggest compliment you can make," Mirren said.
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"I just felt as though I was meeting a very nice chap. There was no prince-ness about him at all."
Mirren, who got the BAFTA award's highest honour, said she was overwhelmed to get recognised.
"I didn't realize just how big a thing it was to receive a fellowship. They don't give it out every year. So now I am just completely overwhelmed," she said.