Among them, was Kate Middleton, The Duchess of Cambridge - who looked stunning as always.
Kate will next be seen on Saturday when she attends Trooping the Colour and joins in the carriage procession and flypast viewing on the balcony at Buckingham Palace. Prior to this she was one of the Queen's senior housemaids and has worked for the royal family for over a decade.
On the other hand, the Duchess of Cornwall was equally gorgeous when she wore a Boucheron tiara for the occasion.
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When Kate was in high school, she reportedly had no interest in her male classmates but shared her feelings about Prince William. President Trump escorted the Queen inside the banquet room as the first lady followed behind.
Mr Trumps four adult children, Ivanka, Tiffany, Eric and Donald Jr along with British Prime Minister Theresa May were also in attendance.
Kate Middleton guided her children around the garden. As for her hair, the mother-of-three had her hair elegantly pulled back into a slick chignon.
She was seen donning, for the first time, a special blue and gold sash as she made her entrance along the red carpet with the Royal Family. "HRH The Duchess of Cambridge".
Of course, the U.S. president and first lady were also in attendance that evening.