Lady Gaga has conquered the fashion world, but that doesn’t mean she can’t send herself to the bottom of the professional ladder for the sake of style. The pop icon reportedly is preparing for an internship with famous milliner Philip Treacy, who designs hats for celebrities and royals—including the notorious creation Princess Beatrice wore at the wedding of Prince William and Kate Middleton. And Gaga has company: from Kanye West at Fendi to Mary-Kate Olsen with Annie Leibovitz, see established stars who have worked as interns.