The official Pottermore Twitter account
revealed that Saturday, March 9, marks Divination Sybill Trelawney's birthday. This information had not been revealed elsewhere before, either on Pottermore's site or in any of the
Harry Potter books. The Tweet, updated Saturday afternoon, confirmed the following.
Trelawney was portrayed by Oscar-winning actress Emma Thompson in the
Harry Potter film series. Happy birthday to Professor Trelawney!