VIDEO : Emma Watson Posted A Throwback Photo To Celebrate J.K. Rowling's Birthday

J.K. Rowling turned 54 and Emma Watson congratulated the ?Harry Potter? author with a throwback photo. The photo shows Watson with Rowling and Evanna Lynch all dressed up in Halloween attire. Watson wrote: "Sexy and scary! You smashed this. All the love to you Jo. Happy Birthday!!!!? According to Business Insider, Lynch responded to the photo, saying she didn?t know it existed. Both Watson and Lynch starred in Rowling?s ?Harry Potter? series, which began in 2001.