The Queen will attend cabinet on Tuesday to mark her Diamond Jubilee, the first monarch to do so since Queen Victoria.
Downing Street confirmed on Monday morning that the Queen would take a seat alongside David Cameron and his cabinet in No. 10 as an "observer".
The prime minister should have no trouble welcoming the Queen to his house as he is a fifth cousin of the monarch - Christmas is a time for family after all.
Cameron is said to have got a helping hand for Her Majesty when he applied for his first job at Conservative Central Office in the late 1980s.
According to a biography the man due to interview the young Cameron received a phone call from the Palace telling him: "I am ringing to tell you that you are about to meet a truly remarkable young man."
Last week the Queen grabbed headlines by commenting that the Financial Services Authority had got "a bit lax" during the banking crisis of 2008.
"The Financial Services - what do they call themselves, the regulators - Authority, which was really quite new... it didn't have any teeth," she said.
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Winston Churchill was initailly sceptical of the new young Queen, calling her "just a girl".
The Queen and Eden disagreed heavily over the Suez crisis calling him 'mad' over his decision to intervene militarily
Macmillan was "astonished by her grasp of detail" but also noted that she was irritated when treated like a woman
A shared love of dogs allowed the two to develop a close relationship
Wilson described his visits with the Queen as "going to see mother".
Edward Heath, far right, clashed repeatedly with the Queen. A former courtier recalled how that Queen was never comfortable with him. At an event in 2002 at Buckingham Palace that the Queen held to honour all of her surviving Prime Ministers, Heath dozed off.
Callaghan was very secretive of his meetings with the Queen and it is claimed that the two indulged in 'flirtatious banter'
The Queen's relationship with Thatcher was tense and the Queen allegedly referred to her as "that lady"
Major appreciated the ability to talk to the Queen about anything, even things he did not feel comfortable talking to his ministers about.
The Queen was devastated when Blair decommissioned the Royal Yacht Britannia. She was also very critical of his close relationship with George W Bush
Brown took great care to follow traditional protocol around the Queen
Cameron has recently praised the value of his weekly meetings with the Queen saying that he appreciates her views which are capable of seeing through the politics.