The firstborn son of Britain's
Among the guests were his great-grandmother,
Earlier in the day, the duke and duchess of Cambridge reportedly took their birthday boy to Buckingham Palace to spend time with his great-grandfather,
George is the third in line to the British throne, behind his father, William. First in line is
It's the first time in living memory that a future monarch celebrated his first birthday with both parents present, the newspaper said.
However, George's paternal grandfather and his wife Camilla, Duchess of
Avid royalists camped out and placed balloons and flags outside the palace, where the family keeps its residence in a newly refurbished apartment.
On Saturday and Monday, Wills and Kate marked the occasion by releasing three new photos of their son walking and chasing butterflies at the National History Museum in early July.
"We would like to take this opportunity on George's first birthday to thank everyone over the last year, wherever we have met them, both at home and overseas, for their warm and generous good wishes to George and our family," the Cambridges said in a joint statement Monday.