Emma Watson arrived at Heathrow International Airport earlier today in a dark fedora and suede trench. Yesterday marked the beginning of the end for the Harry Potter actress and her group of costars. The Harry Potter and the Deathly Hallows Part 2 premiere took place in London's Trafalgar Square with close to 20,000 fans coming out to bid farewell to the cast and crew. Emma, who picked a beautiful Oscar de la Renta gown for the occasion, broke into tears thanking her extended Harry Potter family for the wonderful times they shared together on set. Her costar Rupert Grint got a laugh from the crowd when he jokingly celebrated writer J.K. Rowling for everything she's done for the "ginger people." Pals Emma, Rupert, and Daniel Radcliffe partied together late into the night at the postpremiere soiree, enjoying their final curtain call as Hermione, Ron, and Harry at home in the UK. The stars are bound for the States this weekend with the US press junket scheduled for Sunday, and join us on Monday when we stream LIVE from the NYC Deathly Hallows 2 premiere!