VIDEO : Julianne Hough Was an Extra in 'Harry Potter'

Even the biggest Harry Potter fans may not have spotted Julianne Hough in one of the book-turned-movies. In celebration of the 20th anniversary of the J.K. Rowling's beloved novel, Harry Potter and the Philosopher?s Stone, the Dancing With the Stars judge shared some throwback pics of when she was an extra in the 2001 film, Harry Potter and the Sorcerer's Stone. Hough portrayed an uncredited Hogwarts schoolgirl in the film franchise's first installment, and can be spotted in several scenes.