Dame Helen MirrenHaving played the royal matriarch in two productions, 'The Queen,' for which she won an Oscar, and 'The Audience,' Dame Helen has visited Buckingham Palace on a number of occasions - but she still gets starstruck. "You're thinking, 'It's the Queen, it's the Queen!' I am genuinely always astounded by her aura, her twinkle, her presence. It never fails to surprise me and again it's what everyone says when they meet her – it was what overwhelmed me the first time I met her." Photo: Getty Images