US TV star Patrick Dempsey is set to shock fans on broadcaster Barbara Walters' upcoming pre-Oscars special by revealing he's dyslexic.

The 1980s movie pin-up and SWEET HOME ALABAMA star appears alongside George Clooney, Matthew Mcconaughey and Mariah Carey on the annual special, which airs in America on 1 March (06).

Walters reveals, "He doesn't do cold readings. He tries to get the script in advance so that he can memorise it."

Dempsey has become a major star again thanks to his role as DR DEREK SHEPHERD in hit medical drama GREY'S ANATOMY.