Prince William was spotted in the stands watching Aston Villa's Champions League defeat to Monaco in the Principality on Tuesday night.
The boyhood Villa fan has been a frequent fixture for his side's European travails, first taking in their historic return to the competition at the start of the season against Bayern Munich at Villa Park.
The Prince of Wales was delighted to admit that he had lost his voice cheering on the Birmingham-based club's first home game in Europe's elite competition for 41 years, as he noted that he 'couldn't quite believe' Unai Emery's side had pulled off the 1-0 win.
The 42-year-old is also a regular visitor - schedule permitting - to the training ground Bodymoor Heath and has been caught in conversation with Emery and his players.
But the prince cut a somewhat more nervous presence on Tuesday evening on the French Riviera, as Emery's side went 1-0 behind after just eight minutes.
Prince William had made the short trip across the Channel just hours after visiting Centrepoint's Ealing service and meeting with people supported by the homelessness charity.
The prince was also snapped in the stands by an overwhelmed fan, who shared the candid picture on social media with the caption: 'Say, what do you think the probability is in a lifetime of coming face to face with Prince William, just a few centimetres away from him? (Union flag emoji, crown emoji)
'I ADMIT I CAN'T GET OVER IT (heart eye emoji)
'(thank you for this emotion @AS_Monaco)'.
Also in attendance at the Stade Louis II was Prince Albert II, supporting his local side in the company of the club's president and owner Dmitry Rybolovlev.
But as well as travelling to support Villa in Europe, the future king has mixed and mingled with fans at top flight games.
Last week saw Prince William buy a round for Villa fans waiting for matchday at a Wetherspoons near Birmingham New Street Station ahead of their Premier League clash with Everton.
He bought a round of beers for eight Villa fans and sipped a pint of Bulmers cider, staying for around half an hour before catching a train back to London.
Steve Jones, 56, Villa fan for last 35 years, said: 'We were contacted by the club saying Prince William wanted to meet a delegation of Villa fans as he was in Birmingham as he wanted to keep in the loop with everything going on at Villa.
'He was fantastic. I was quite amazed about how engaged he was with the club, his interest. He's not a fair weather fan. He really loves the club with a passion.
'We spoke about the club, the transfers, the pending Champions League trip to Monaco, and all things Aston Villa. He asked many questions - he's got a good level of interest.
'It was 95 per cent chat about Villa as that's out shared interest but a bit about his family. Young George is a Villa fan but he didn't want all three to be Villa fans.
'He was massively interested and seemed a really genuine guy and all he wanted to do is talk about Villa.
'He said he was hopeful about beating Everton tonight and would be watching but was wary about new manager syndrome, or rather old manager syndrome.'
The prince got his wish, with Villa running out the 1-0 winners courtesy of a 51st-minute goal by Ollie Watkins.
Jones also revealed that Prince William is a habitue of Villa fan forums in a bid to 'keep abreast of Villa gossip'.
'He goes under different names and he posts on there because that's how he gets the feeling of what's going on and what's the opinion,' Jones added.