Duchess Kate, Donald Trump and Justin Trudeau join the Queen for reception at Buckingham Palace

World heads of states that are part of NATO stepped out to Buckingham Palace on Dec. 3 for the annual dinner that is hosted by the <strong><a href=/tags/0/british-royals>Royal Family</a></strong> at <strong><a href=/tags/0/queen-elizabeth-ii>the Queen</a></strong>'s official residence. Canadian Prime Minister <strong><a href=/tags/0/justin-trudeau>Justin Trudeau</a></strong>, US President <strong><a href=/tags/0/donald-trump>Donald Trump</a></strong> and US First Lady <strong><a href=/tags/0/melania-trump>Melania Trump</a></strong> were among those who joined Her Majesty, <strong><a href=/tags/0/kate-middleton>Duchess Kate</a></strong>, <strong><a href=/tags/0/prince-charles>Prince Charles</a></strong> and <Strong><a href=/tags/0/camilla-parker-bowles>Duchess Camilla</a></strong> at the reception. <p><strong>Click through the gallery (or keep scrolling if you're on mobile) to see the best photos from the evening - along with some of the incredible style!</strong> <p>Photos: &copy; Victoria Jones/AFP via Getty Images and Yui Mok/AFP via Getty Images
UK Prime Minister <strong><a href=/tags/0/boris-johnson>Boris Johnson</a></strong> was among the first leaders to arrive at the reception. <p>Photo: &copy; Dan Kitwood/Getty Images
The Trumps were not far behind him. <p>Photo: &copy; Dan Kitwood/Getty Images
Here's a closer look at Melania's unique yellow and purple <strong><a href=/tags/0/valentino>Valentino</a></strong> cape dress. <p>Photo: &copy; Richard Pohle/AFP via Getty Images
Charles and <strong><a href=/tags/0/camilla-parker-bowles>Duchess Camilla</a></strong> also met with US President <strong><a href=/tags/0/donald-trump>Donald Trump</a></strong> and US First Lady <strong><a href=/tags/0/melania-trump>Melania Trump</a></strong> earlier in the day. <p>Photo: &copy; Victoria Jones/AFP via Getty Images
Justin arrived with a big smile on his face. <p>Photo: &copy; Dan Kitwood/Getty Images
Once inside, Canadian Prime Minister <Strong><a href=/tags/0/justin-trudeau>Justin Trudeau</a></strong> spent some time talking with Boris and <strong><a href=/tags/0/princess-anne>Princess Anne</a></strong> over drinks. <p>Photo: &copy; Yui Mok/AFP via Getty Images
Justin also said hello to <strong><a href=/tags/0/queen-elizabeth-ii>the Queen</a></strong>, who was her usual stylish self in a patterned green dress with a matching scarf. She looked very pleased to see him. <p>Photo: &copy; Yui Mok/AFP via Getty Images
Earlier in the day, Justin had an audience with <strong><a href=/tags/0/prince-charles>Prince Charles</a></strong> at Clarence House. <p>Photo: &copy; Victoria Jones/AFP via Getty Images
Anne also took some time to chat with German Chancellor <Strong>Angela Merkel</strong>. <p>Photo: &copy; Yui Mok/AFP via Getty Images
Her Majesty was also keen to get some time in with Angela. <p>Photo: &copy; Yui Mok/AFP via Getty Images
Once everyone had arrived, the leaders all posed for a photo with Her Majesty. <p>Photo: &copy; Yui Mok - WPA Pool/Getty Images
Melania spent some time talking to the Queen after the photo. <p>Photo; &copy; Yui Mok/Pool/AFP via Getty Images
Kate later dropped in and looked incredible, wearing a bespoke <strong><A href=/tags/0/emilia-wickstead>Emilia Wickstead</a></strong> dress. <p>Photo: &copy; Yui Mok/AFP via Getty Images
Camilla and Charles looked very pleased to see Angela. <p>Photo: &copy; Yui Mok/AFP via Getty Images
Camilla also spent some time chatting with Justin. <p>Photo: &copy; Yui Mok/AFP via Getty Images
The Queen made rounds to every leader at the reception, and had what looked like a lively discussion with Donald and Melania and Charles and Camilla while NATO Secretary-General <Strong>Jens Stoltenberg</strong> looked on. <p>Photo: &copy; Yui Mok/AFP via Getty Images
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