"I'll be about 87 years old at the wrap party, but I've said yes," said the actor, who will take on the beloved role for HBO's Harry Potter series

John Lithgow confirmed in an interview that he's playing Professor Dumbledore in HBO's upcoming 'Harry Potter' series.

It seems John Lithgow spilled the (Bertie Bott's Every Flavor) beans about his involvement in HBO's in-the-works 'Harry Potter' series. 'A total surprise to me,' he says.