Queen Elizabeth becomes the country's first monarch to attend a British Cabinet meeting since the 18th century.
She is given a royal welcome at Number 10 Downing Street.
The last monarch to attend such a meeting is believed to have been George III in 1781
Prime Minister David Cameron offered her a warm welcome to the meeting.
She spoke twice -- reportedly about her next Speech -- which she suggested should be on the shorter side.
The Queen -- celebrating her Diamond Jubilee year, was also given table mats with images of Buckingham Palace as a Christmas gift.
She offered her own Christmas greetings in addition to the rare glimpse of the royalty at the Cabinet.
A Cabinet fit for a Queen (0:57)
Dec. 18 - Britain's Queen Elizabeth becomes the country's first monarch to attend a Cabinet meeting since the 18th century. Deborah Lutterbeck reports. ( Transcript )