On the cover of the July edition of Elle UK, Pharrell Williams replaced his usual headline-grabbing headwear with a traditional Native American headdress.
Many Native Americans and others were upset about the appropriation of the garment, which is considered to be the sacred garb of chiefs and warriors. They created the "#NotHappy" hashtag on Twitter.
In a statement responding to the controversy, Pharrell has apologized, saying he meant no disrespect.
"I respect and honor every kind of race, background and culture," Pharrell says. "I am genuinely sorry."
Elle UK has not yet responded to a request for comment.