At the end of the day, everyone is just human.
And the musicIan didn't hold back on his kind words at the fête, which was hosted at the Four Seasons Restaurant by the American Friends of The Royal Foundation.
"If you're American and you watch movies on the royal family historically, it seems [like] fantasy," the Grammy winner tells U.K.'s The Telegraph, "but to see the human in Harry, he's a normal guy."
The musician also gave props to Harry for his "beautiful heart and great upbringing," adding that it "makes you believe that your family is royalty as well."
"He doesn't have to do charity, he doesn't have to care, he could just be wild," Will.i.am explained.