Darren Criss may be one of the most famous fans of Harry Potter, but he started out just like any other fan -- a kid reading along.

"It was in a section at a book fair at my school in 4th grade," he told us. "I bought every book as they came out."

We caught up with the "Glee" star at LeakyCon, which he attended with his Team Starkid production company, famous for their Harry Potter themed musicals. Criss made his name playing the boy wizard in the parodies, before making the transition for viral fame to mainstream TV success.

After the jump, check out our interview with Criss where he discusses his first Potter memories, attending the London Harry Potter premiere and the response of Team Starkid fans.