Sophie, the Duchess of Edinburgh was seen comforting Princess Kate during the Remembrance Sunday Service.
The Princess of Wales undertook royal duties for the second consecutive day as she watched the service at the Cenotaph.
The milestone appearance is the first time the Princess of Wales has done back-to-back public appearances across two days since she was diagnosed with cancer.
The princess attended the Festival of Remembrance at the Royal Albert Hall on Saturday evening alongside Prince William.
Sophie, the Duchess of Edinburgh was seen comforting Princess Kate during the Remembrance Sunday Service.
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Princess Kate appeared visibly moved during the solemn ceremony in Whitehall, where she was seen bowing her head and closing her eyes in quiet reflection.
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Princess Kate appeared visibly moved during the solemn ceremony in Whitehall, where she was seen bowing her head and closing her eyes in quiet reflection.
Sophie was seen comforting the princess, placing her hand on Kate's back.
Dressed in a black military-style jacket, the Princess wore her traditional three poppies - a poignant tribute to her great-grandmother's three brothers who lost their lives during the First World War.
Vice Admiral Sir Tim Laurence, the Duke of Kent and the Duchess of Glouchester also viewed the service from the balconies.
Dressed in a black military-style jacket, the Princess wore her traditional three poppies - a poignant tribute to her great-grandmother's three brothers who lost their lives during the First World War.
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Prince William and Sophie's husband Prince Edward, both laid wreaths at the Cenotaph.
King Charles laid the first wreath during the National Service of Remembrance to mark the Armistice of the First World War and all other conflicts involving British and Commonwealth forces.
The wreath the King laid closely resembles the wreath produced for HM King George VI.
The wreath contained 41 open-style poppy petals made from bonded fabric and is mounted on an arrangement of black leaves – traditional for Sovereign’s wreaths.
King Charles laid the first wreath during the National Service of Remembrance to mark the Armistice of the First World War and all other conflicts involving British and Commonwealth forces.
PA
The Royal British Legion's veteran parade saw an impressive turnout of 10,000 veterans representing 326 different armed forces and civilian organisations.
Thousands of people lined Whitehall to witness the annual commemoration.
This year's Remembrance Sunday commemorates the 80th anniversary of the D-Day landings and the contribution of the World War Two generation.
