Katrina Darling—Kate Middleton’s burlesque dancer cousin—appears on the cover of Playboy’s September 2012 issue. Credit: Courtesy of Playboy/Marlena Bielinska

What will Duchess Kate say?!

Katrina Darling, Kate Middleton's second cousin, graces the September cover of Playboy wearing sexy black lace lingerie; inside, she stars in a nude eight-page pictorial.

Nudity is nothing new for the burlesque performer, who has been performing her striptease show God Save the Queen in England, Europe and the United States.

Her cousins Kate and Pippa Middleton haven't yet seen Katrina's show -- mainly because Katrina only learned about her royal relation shortly before Kate married Prince William in April 2011.

"It was the most ridiculous thing I ever heard," Katrina says of a phone call from a British reporter informing her that she and Kate, 30, are cousins. "It's not every day something like that happens."

Her royal-themed show, she says, offers "a platform for me to explore these kinds of things. The more into it the audience is, the more into it I am."

The September issue of Playboy hits stands this Friday, August 17.