"I'm a book purist so...I've read each one of them three or four times each," Emma says.
"I usually read them before we start [filming], but I was quite late reading the last one," Rupert admits.
Emma then gives her Rupert the stink eye until he exclaims, "I did read it! I mean, I left it quite late... I was probably the last one to read it..."
"In the world. Ever," Emma interjects with a laugh. "In the universe." Watch the exchange after the jump, and stay tuned for Harry Potter and the Deathly Hallows: Part 1 when it arrives in theaters on November 19, 2010.