Thompson following in the footsteps of ex-hubby

Emma Thompson is following in the footsteps of former husband, Belfast-born Kenneth Branagh.

She's joining the cast of the third Harry Potter adventure, The Prisoner of Azkaban, playing Sybill Trelawny, the etheral and eccentric Professor of Witchcraft and Wizardry.

Ken played a particularly fopish Proff in the second Harry Potter film.

Sir Michael Gambon takes over the role of Professor Albus Dumbledore, played by the late Richard Harris.