London, Feb 21 : Late Hollywood actor Heath Ledger's former girlfriend Naomi Watts has asked the Oscar bosses to honour him with a posthumous award for his role in `The Dark Knight'.

The `King Kong' actress, who dated Heath for two years, said that he deserved the award for his brilliant portrayal of `The Joker' in the flick.

"I hope he does win. He was amazing and his work should be recognized," the Daily Express quoted Watts, as saying.

Watts, who fist met Heath on the sets of Ned Kelly, revealed that she always knew that he was an extraordinary actor.

"I always knew it from the time we met on Ned Kelly. When we first rehearsed together I was blown away by his presence and the detail in his performance. I just thought, ''Wow, this guy is extraordinary, he has got something really special," Watts said.

Heath has already been posthumously honored with a Golden Globe and a BAFTA for his role of `The Joker'. (ANI)