Dame Helen Mirren has confessed to a bout of pre-Oscar nerves.

She is such a hot favourite to land the Best Actress award on Sunday for her starring role in The Queen that bookmakers have already closed the betting.

But Dame Helen, 61, fears her winning streak – more than 20 prizes including a Bafta and a Golden Globe – may count against her.

“I don’t feel greedy exactly, but I worry people must be getting fed up with me,” she told The Daily Telegraph.

“I’m nervous about the Oscars. I mean, I’m calm in myself. But I feel nervous because I’m representing myself, the film, my country – and my monarch. It’s a lot. I just hope I don’t make a fool of myself.”

But she insisted: “I’m not weary of awards yet. I’m happy to see this through.”

The Queen’s director, Stephen Frears, described Dame Helen’s casting as the monarch as ‘sort of the best piece of casting there’s ever been in the world’. He is a nominee for Best Director.

But he does not rate his chances against the competition, which includes Clint Eastwood for Letters From Iwo Jima and Martin Scorsese for The Departed.

“Against Marty or Clint Eastwood? I don’t take that as a serious possibility. So I’ll have a nice time. I’ll worry more about the other people,” he said.