Lauren Conrad knows her royal family trivia. The former MTV reality star turned New York Times Best-Selling Author won $50,000 for domestic violence charity m.powerment by mark during a special appearance on ABC’s Who Wants To Be A Millionaire? 10th Anniversary Special Wednesday night.

For the win, Lauren had to answer the following question correctly: “For years, Prince William has had a high publicized on-again/off-again relationship with a girl named what?” A.) Anne B.) Judith C.) Kate D.) Emma.

Of course, us pop culture junkies already know that Will’s longtime girlfriend is college sweetheart Kate Middleton.