Prince Harry certainly seemed to be on top form as he joined his brother and sister-in-law at the Queen's service of thanksgiving

Naughty Prince Harry shares a giggle with Kate at Queen's service

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Close friendship: Kate and her brother-in-law are known to be great pals

Naughty Prince Harry shares a giggle with Kate at Queen's service

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Prince Harry shares a giggle with Kate Middleton at the Queen's birthday service | Daily Mail Online

Naughty Prince Harry shares a giggle with Kate at Queen's service

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Private joke: The Duchess of Cambridge was kept entertained by Prince Harry at today's thanksgiving service for the Queen

Naughty Prince Harry shares a giggle with Kate at Queen's service

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Prince Harry appeared to be covering his mouth to contain his laughter at one point

Naughty Prince Harry shares a giggle with Kate at Queen's service

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Kate's eyes closed as she shook with laughter as Harry made a grimace, while William stared in the other direction

Naughty Prince Harry shares a giggle with Kate at Queen's service

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Perhaps Prince Harry had overheard one of his grandfather's famous gaffes, but whatever the joke was the naughty Prince was certainly not keen to share with his brother William

Naughty Prince Harry shares a giggle with Kate at Queen's service

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Prince Harry was with Ellie at the same event in 2011

Prince Harry 'is secretly courting Ellie Goulding'

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One insider close to Harry said that after the polo there was a late night party where picture-taking was banned to put the celebrities at ease. Pictured: Ellie Goulding (C) is presented with flowers as players (L to R) Prince William, Duke of Cambridge, Luke Tomlinson, Mark Tomlinson, Prince Harry and William Melville-Smith

Prince Harry 'is secretly courting Ellie Goulding'

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Prince Harry hugging Ellie Goulding

Prince Harry 'is secretly courting Ellie Goulding'

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The pair were laughing and smiling together

Prince Harry 'is secretly courting Ellie Goulding'

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Harry was back on his own again today as he visited the Double Jab boxing club in New Cross, south London

Springsteen girl sets Twitter alight with Prince Harry rumour

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Olivia Tallent, whose father plays with Bruce Spingsteen posted this snap of her with Prince Harry yesterday

Springsteen girl sets Twitter alight with Prince Harry rumour

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Harry asked some of the veterans what the atmosphere was like on the ships crossing the Channel. One veteran replied that no one talked much, saying, 'It's amazing to think... just running off a boat like that.'

Prince Harry is told off by a D-Day veteran for not wearing a tie

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Prince Harry signs the visitors book as he attends the reception for the Normandy Veterans

Prince Harry is told off by a D-Day veteran for not wearing a tie

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He listened intently to John Dennett and Frank Diffell in the Map Room in the building used by General Dwight D Eisenhower as  his advanced headquarters for the landings

Prince Harry is told off by a D-Day veteran for not wearing a tie

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Royal Navy veterans Frank Diffell and John Dennett, who both served on landing craft, posed for pictures with him in the room where Eisenhower plotted the invasion

Prince Harry is told off by a D-Day veteran for not wearing a tie

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The veterans remember the Normandy Landings - the largest seaborne operation in history - that took place on June 6, 1944

Prince Harry is told off by a D-Day veteran for not wearing a tie

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Harry talked to those who took part in the D-Day Landings ahead of their annual pilgrimage to Normandy

Prince Harry is told off by a D-Day veteran for not wearing a tie

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Harry talked to 92-year-old Anthony Colgan who took part in the D-Day Landings in 1944

Prince Harry is told off by a D-Day veteran for not wearing a tie

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D-Day Revisited organises the reunion for the veterans of the Normandy campaign and funds their annual pilgrimage to the beaches where they fought in 1944

Prince Harry is told off by a D-Day veteran for not wearing a tie

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Harry met John Dennett (left) and Frank Diffell (right) in the Map Room of Southwick House, Portsmouth

Prince Harry is told off by a D-Day veteran for not wearing a tie

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Prince Harry greets Ivor Anderson as he attends a reception for Normandy Veterans at Southwick House on June 2, 2016 in Portsmouth, England. The veteran couldn't wisecracking, 'where's your bloody tie?'

Prince Harry is told off by a D-Day veteran for not wearing a tie

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Prince Harry and Sergeant Marks share a joke in Orlando last month. Swimming was initially part of Elizabeth's rehabilitation after a serious hip injury, but she soon fell in love with it and went on to be an Invictus champion

Prince Harry presents an Invictus Games gold medal to hospital staff

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Last month Elizabeth, who sustained hip injuries in Iraq in 2010, gave Harry her 100m freestyle gold medal to pass on to the hospital that saved her life when she arrived in the UK to take part in the 2014 Invictus Games

Prince Harry presents an Invictus Games gold medal to hospital staff

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