Britain's Prince Charles and Camilla, the Duchess of Cornwall, look on during a tour through the old town of Mdina during the Commonwealth Heads of Government Meeting
Britain's Prince Charles and Camilla, the Duchess of Cornwall, look on during a tour through the old town of Mdina during the Commonwealth Heads of Government Meeting (CHOGM) in Mdina, Malta November 28, 2015. Reuters/Matt Cardy/Pool

Prince Charles showed off his lighter side, dressed in the Scottish traditional dress of kilt and entertained his guests Ant and Dec. The British comedy duo Anthony McPartlin and Declan Donnelly spent time with the second in line to the British throne for a documentary “When Ant and Dec Met The Prince: 40 Years of the Prince’s Trust.” The 90-minute documentary was aired on ITV Monday.

The 67-year-old prince showed off his singing prowess during an evening at his Scottish home Dumfires House. Charles delighted his guests by a rendition of Aberdeenshire song “The Bonnie Lass o’Fyvie” dressed in kilt, Mirror UK reports. The TV presenters were joined by their wives Lisa Armstrong and Ali Astall.

The pair, who usually present entertainment shows such as “Britain’s Got Talent” was clearly impressed by the royals’ tune. Fellow dinner guests including Rod Stewart and his wife Penny Lancaster were also surprised that the prince could sing. “He done all right didn't he,” said Ant, to which Dec replied: “It’s a yes from me.”

Ant and Dec were invited to Dumfries House during the year they spent shadowing the royal for the documentary. The presenters secured personal interviews with Charles’ nearest and dearest for the documentary, in which the grandfather to Prince George and baby Princess Charlotte also revealed he is enjoying having a granddaughter.

The duo took to Twitter on Tuesday and wrote:

Even Prince William, Prince Harry and Camilla, the Duchess of Cornwall spoke about Charles. The brothers recounted how their dad loved to embarrass them when they were studying in school. They said that the entire family, especially their grandfather the Duke of Edinburgh, has an eerie sense of humour: they laugh when things go wrong.

William also said how having two kids has made him realise how precious life is. He added the idea of not being around to see your children grow up was horrible. Their mother Princess Diana died when he was only 15. Charles hoped that one of his sons would take an interest in taking over the Prince’s Trust, adding in a lighter vein that he was getting past his “sell by date,” Hello reports.

The Princes’ Trust was set up by Charles in the 1970s to help disadvantaged children “who are unemployed or struggling at school, to transform their lives.”