Published Tuesday, 18 February 2014
The actress was awarded a BAFTA Fellowship by Prince William, the Queen's grandson, on Sunday, and 24 hours later she was in his company again at the palace.
Mirren was welcomed by William's wife, the Duchess of Cambridge, who joked that her husband had referred to the actress as "granny" at the awards ceremony.
Last week, a nervous Mirren revealed she hoped that Prince William's presence at the BAFTAs was a sure sign that the royal family liked her Oscar-winning turn as his grandmother in The Queen.
She said: "I don't think he'd do it if the royal family felt I had messed up. I hope it's a sign they don't think I messed up. But I don't know, and I will never know for sure."
Monday night's Royal Academy of Dramatic Art Reception at Buckingham Palace was also attended by Helena Bonham Carter, director Steve McQueen, Roger Moore, Joan Collins, Dame Angela Lansbury, Ralph Fiennes, Uma Thurman and Joely Richardson.
Guests were treated to a performance in the palace's ballroom featuring emerging talent and some of the country's much loved and well known stars.
The Queen and her guests watched the performance and were entertained by songs from the musical Oh! What A Lovely War performed by Rada students.
They were introduced by Hugh Laurie who welcomed the guests to the short performance and acted as a compere.
Speaking about being introduced to the head of state Mirren said: "You're thinking 'its the Queen it's the Queen'," and when asked if she still got starstruck replied: "Of course, even more so I think because I feel self conscious, you know."
She added: "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."