The event was held by Eugenie's friend, model-turned-nutritionist Gabriela Peacock.
The 35-year-old, who created GP Nutrition, is close to both Eugenie and her sister Princess Beatrice, and accompanied them on a skiing holiday to Verbier in February 2015.
After the dinner got underway and everyone was having fun, James Blunt, 42, decided he would like to be knighted.
Princess Beatrice, 28, said that could be arranged, according to the Sun, and fetched a ceremonial sword.
But when she swung it behind her to do the deed, and jokingly said ‘Arise Sir James’, she accidentally swiped the redheaded singer on the cheek, leaving him with a deep cut.
She was baptised at the Church of St Mary Magdalene, Sandringham, by the Bishop of Norwich, on 23 December 1990.
She was the first royal baby to have a public christening, and the only one of the Queen's grandchildren not to be baptised in the Lily font.