Prince William asked about Prince Harry marrying Meghan Markle – see how he responded!

Prince William didn’t let any details about his younger brother’s future slip! The Duke of Cambridge was asked about Prince Harry and Meghan Markle’s relationship during his visit to Milton Keynes, on Tuesday, September 26, and couldn’t help but laugh.

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VIEW GALLERY Prince William was all smiles and laughs as he was asked about Prince Harry and Meghan Markle's future Photo: Getty Images

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The father of two visited William Cowley Parchment Makers, which makes vellum for royal documents and for use in Parliament. The general manager for the company, Paul Wright, told the Duke: "If Prince Harry marries Meghan then his certificate will be in our vellum." Speaking about the Duke of Cambridge's amused response to his comment, Paul said: "He just laughed - a nice laugh."

GALLERY: TIMELINE OF MEGHAN AND HARRY'S ROMANCE

Prince Harry and Meghan made their first official joint appearance at the Invictus Games on September 25. The pair arrived hand-in-hand to watch wheelchair tennis at Nathan Phillips Square. The actress and royal were spotted laughing and chatting with each other during the match. Betting odds for the couple's engagement have been lowered, with William Hill spokesman Rupert Adams saying: "They look very happy in each other's company and I for one expect an announcement imminently."

VIEW GALLERY Meghan and Harry made their first public appearance together at the 2017 Invictus Games Photo: Getty Images

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Prince William visited Milton Keynes on a solo engagement as his wife, Kate Middleton, has been recovering at home from severe morning sickness while expecting their third child. However, the Duchess of Cambridge is set to make her first public appearance since the baby news broke, at a reception at Buckingham Palace on World Mental Health Day on October 10.

VIEW GALLERY William had a solo enagement in Milton Keynes Photo: Getty Images

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MORE: Prince Harry and Meghan Markle make their first high profile appearance

On Sunday, William accompanied Queen Elizabeth to church near Balmoral. The royals were spotted making the short journey from Balmoral Castle to Crathie Kirk for the morning service, with Prince Charles and the Duchess of Cornwall traveling separately in his green Audi.