Princess Eugenie lets her baby son August bounce on her knee during the anniversary competition

Princess Eugenie was spotted in the royal box at the Platinum Jubilee competition with husband Jack Brooksbank holding their one-year-old son August, who arrived dressed for the occasion

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Queen’s Jubilee: Princess Eugenie hops August on her knee

Proud mum Princess Eugenie bounced her baby son August on her lap after taking him to the anniversary competition alongside husband Jack Brooksbank.

TV cameras caught Eugenie holding up the one-year-old as the colorful performers walked past the royal box in the Mall.

And the little boy came dressed clearly for the occasion as he’s wearing a very patriotic blue sweater with a Union flag on the front.

At one point he even waved as some of the cast walked by before his father Jack, who was smartly dressed in a suit, was seen cuddling his son.

But he wasn’t the only youngster in the royal box – Prince George, Princess Charlotte and Prince Louis also stole the show once again with a series of facial expressions.

Meanwhile, after the pageant, the Queen delighted Platinum Jubilee revelers with a much-anticipated performance on the balcony of Buckingham Palace, sealing four days of celebrations.

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Surrounded by her family, the monarch was cheered by thousands of well-wishers after the pageant told the story of her life and the nation with an eccentric, funny and imaginative carnival-like display.

Earlier in the day, Eugenie and her older sister Princess Beatrice tried their hand at plate spinning and bowling during a surprise appearance at an anniversary party.

They attended a grand anniversary luncheon at Paddington Recreation Ground hosted by Westminster Council.

It was one of thousands of similar luncheons held across the UK over the centenary weekend, attended by an estimated 15 million people.

There they mingled with members of the local community, including NHS workers, a social food business and members of Octavia Housing, which runs a friendship service for the elderly.

Introducing herself to a table of Octavia House volunteers and service users, Beatrice said: “My name is Beatrice, the queen is my grandma, I am very, very lucky.”

Beatrice then went to another table with more people from the charity.

She spoke to Paddington Bear at the Platinum Party at the Palace about the moment at yesterday’s concert when the Queen pulled a jam sandwich out of her purse.

“I always wondered what was in her purse, and now we know,” Beatrice said. “The secret is out, it’s a jam sandwich.”

The princesses also took time to practice turning their plates.

Circus performer Tim Eagle showed the couple how to spin the plates, with Eugenie receiving a round of applause for her efforts.