The royal was spotted with two of his longtime pals watching their favorite soccer team Aston Villa in a high-pressure match.

Princess Kate stayed home with Prince George, Princess Charlotte and Prince Louis as Prince William left the UK. The Prince of Wales, 42, travelled to Monaco without his wife and three children to watch his beloved Aston Villa lose 1-0 to the hosts.

The future King was spotted cheering on Aston Villa in Monaco on Tuesday - and he was joined by one of his very best friends since childhood, Thomas van Straubenzee

The Prince of Wales made a surprise appearance in Monaco as he watched his beloved football club, Aston Villa, in their latest Champions League group stage fixture. Prince William, 42, was seen looking pensive in the stands at the Louis II Stadium as Monaco took the lead in the first half.

Earlier today, Prince William had an official royal engagement in London, in which he visited homelessness charity Centrepoint. Just hours after his public appearance, the Prince of Wales jetted off to Monaco where he was photographed watching his favorite soccer team, Aston Villa, compete in the UEFA Champions League.

William and Thomas are known to be extremely close friends, with the Wales family even making Thomas godfather to their daughter, Princess Charlotte. Princes William and Harry have known Thomas and his brother,

Prince William made a heartfelt confession about two of his children during his visit to Birmingham this week.

Prince Albert II of Monaco attended a Champions League football match without his wife Princess Charlene on Tuesday night, as he watched AS Monaco face off against Aston Villa. The princess's absence was notable as her husband joined a distinguished crowd that included Prince William.