At the debut King's Trust Global Gala in New York City, Lionel Richie gave an update about King Charles' well-being. 

The Prince Of Wales And Duchess Of Cornwall Visit Barbados
(Photo by Arthur Edwards - Pool/Getty Images)

On Thursday, Lionel Richie shared reassuring news about King Charles' health amid his cancer treatment. The 'American Idol' judge told PEOPLE the monarch, who recently resumed public appearances after being diagnosed with cancer in February, is "doing well."

"Happily I can say, he is doing fantastic," Richie said.

"Again, I understand, he needs to sit still, you know what I'm saying," the "All Night Long" singer added.

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"The most important part is he is doing well. He's back to his duties and so therefore, I wouldn't want the first thing for him to do is come over — let's not prove anything here," the 74-year-old continued.

The Prince Of Wales And Duchess Of Cornwall Visit Barbados
(Photo by Arthur Edwards - Pool/Getty Images)

Richie is a King's Trust Global Ambassador and Chairman of the Global Ambassadors Group.

The Grammy Award winner is confident that once the inaugural event concludes, he'll receive a phone call from King Charles, eager to hear all about the evening's proceedings.

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"Believe me, my question [from him] now is, 'How was it?' After I finish tonight, I'm gonna get that call saying, 'Well, how was it?' " Richie said in jest.

Following his disclosure of a cancer diagnosis in February, King Charles is gradually resuming his royal responsibilities.

Buckingham Palace disclosed that the monarch has a series of upcoming commitments, among them include hosting a state visit at Buckingham Palace for the Emperor and Empress of Japan toward the end of June.