On Tuesday night, King Charles III and Queen Camilla joined President Donald Trump and first lady Melania at the White House. After a day of events and engagements, they broke bread, rubbed elbows, and toasted to more than two centuries of friendship that followed the Revolutionary War. (And, okay, the War of 1812.)

When the royals host a banquet at Buckingham Palace, the dress code is usually white tie, which gives everyone an opportunity to break out their finest heirloom tiaras. But American state dinners tend to be comparatively more casual, with a black-tie dress code—except, it seems, for this year. Tonight, according to CNN, Trump hosted America’s first white-tie dinner since 2007.

Earlier Tuesday, King Charles III became the second British monarch to deliver an address in front of both houses of Congress after his late mother, Queen Elizabeth II, addressed Congress in 1991. Though the speech was likely written by the government—in keeping with long-standing tradition that the monarch speaks for the government during high-profile oration—the king did find a way to put his own flair on a few of the jokes.

“When I address my own parliament at Westminster, we still follow an age-old tradition and take a member of parliament hostage, holding him or her at Buckingham Palace until I am safely returned,” Charles said. “These days we look after our guests rather well, to the point that they often do not want to leave. I don’t know, Mr. Speaker, if there were any volunteers for that role here today.”

The line got plenty of laughs from Congress. We’ll see if the king found a way to keep his hosts laughing back at the White House.

Here are all the images from the UK state visit: