Speaking of Kate's style, take a look back at her stunning wedding look and see how it compares to Meghan Markle's and Princess Diana's in the video here.
The baby prince was also absent from the Royal Family's balcony appearance on Saturday afternoon.
His wife the Duchess of Cambridge took their eldest children Prince George and Princess Charlotte out to support their royal dad as he participated in the game at Beaufort Polo Club in Gloucestershire on Sunday, June 10.
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The summit ended in disarray: US President Donald Trump said the US would not endorse the joint statement from the summit . The following day, Trump's trade czar Peter Navarro made scathing comments about Trudeau during an appearance on Fox News.
Guns play a large role in the British tradition, particularly Royal Gun Salutes, which are considered a "sign of respect" at various functions, such as the birthdays of the Queen, George, and Charlotte, according to the official website of the monarchy.
The young princess later settled in for a cuddle in her mum's lap. He and Kate also spent time playing with a rainbow slinky. The royal kids cheered on their father alongside their mother, the Duchess of Cambridge, Catherine Middleton, on Sunday, following the Trooping the Colour festivities for their grandmother the Queen the day before.
Luckily for the little royals, after behaving well on the balcony of Buckingham Palace, they were able to enjoy a fun day out at the with their mum Kate and let off some steam.
Despite her tender years, the youngster has had plenty of opportunity to practice her royal wave after taking part in overseas tours with the Duke and Duchess.
Sitting on a grass slope together, Savannah, 7, was pictured with her arm around Charlotte.