Donald Trump’s appearance at last night’s lavish state dinner in London has caused quite a stir online — but not for the reasons one might expect.

The U.S. president, 79, and First Lady Melania Trump, 55, were the guests of honour at the regal banquet hosted by King Charles III and Queen Camilla on Tuesday, September 17. The event capped the couple’s first full day in the U.K. as part of Trump’s second state visit.

The pair dined alongside senior royals including Prince William and Kate Middleton. During his speech, Trump praised the Prince of Wales as “really amazing” and described the Princess of Wales, seated next to him at dinner, as “beautiful.” Kate dazzled in a Phillipa Lepley gown paired with the Lover’s Knot Tiara and earrings once worn by Queen Elizabeth II.

Melania, meanwhile, drew mixed reviews for her yellow off-the-shoulder Carolina Herrera gown with a contrasting belt and emerald drop earrings. While some applauded the bold look, others criticised it as “inappropriate” for such a formal royal occasion.