Queen Elizabeth II
Queen Elizabeth II was offended when Tony Blair did a royal blunder on her 50th wedding anniversary. Pictured: Queen Elizabeth II smiles as she arrives before the Opening of the Flanders' Fields Memorial Garden at Wellington Barracks on Nov. 6, 2014 in London. Getty Images/Stefan Wermuth

Tony Blair reportedly offended Queen Elizabeth II after making a royal blunder.

According to Matthew Kirkham, a journalist for Express, Blair and the monarch's relationship has always been rocky. But one mistake may have worsened their relationship with each other.

Prime ministers must report to Buckingham Palace for an audience with the Queen about the planned political events of the week. In a documentary titled "The Queen and Her Prime Ministers," Blair made a slip about the confidential meeting with the Queen in front of their shocked guests.

The footage shows Blair babbling about the highly confidential meeting at the Queen's 50th wedding anniversary. "Actually your majesty’s closing words to me at Buckingham Palace on Tuesday at the end of our weekly session were, 'Please don't be too effusive,'" he said.

The Queen looked stunned in front of her guests and dropped her smile. "It has never ever leaked from Buckingham Palace what the Queen has said to a Prime Minister or a Prime Minister to the Queen," Michael Cockerell said.

In Blair's own memory about the Queen, he said: "Sometimes you can let her be matey with you, but you should never try and do that with her. Because if you do you then get the look."

The publication noted that the 9/11 incident created a test between Blair and Queen Elizabeth II. The former sidled up to former U.S. president George W. Bush, and they both declared war on terror and sent 46,000 to fight in Iraq. The Queen, as the head of state, "feels responsible for them," the narrator read.

According to Cockerell, the monarch was concerned over her own forces, the Royal Navy, Royal Air Force and the Queen's Army.

"There were many reports about how ill-equipped they were to deal with desert warfare," Cockerell explained. "They didn’t have the right clothing, or even the right ammunition and hardware."

The footage revealed that "Elizabeth doesn't agree with Tony Blair's policy."

In related news, Queen Elizabeth II and Prince Philip were recently seen enjoying horse riding separately. The monarch was riding her beloved black Felly pony, Carltonlima Emma with a red poppy to mark the start of Remembrance week. On the other hand, the Duke of Edinburgh went on carriage riding with two stablewomen.

The senior royals including Prince William, Kate Middleton, Prince Harry and Meghan Markle are expected to attend the Remembrance Day on Sunday. The fab four have three engagements over the weekend.