King Charles has reportedly told his daughter-in-law Kate to carry on being one of the nation's favourite royals, despite the same thing happening during his marriage to Diana, leaving him 'jealous'.
Charles would often be overshadowed by his wife, with well-wishers often eager to speak to the princess rather than the future king.
Diana confirmed Charles' jealousy during a controversial Panorama interview in 1995, saying that the apparent envy placed a great strain on the marriage.
Diana, who died in 1997, said: "The pressure on us both as a couple with the media was phenomenal, and misunderstood by a great many people. We'd be going round Australia, for instance, and all you could hear was, 'Oh, she's on the other side.'
"Now, if you're a man like my husband, a proud man, you mind about that if you hear it every day for four weeks. And you feel low about it, instead of feeling happy and sharing it. A great deal of complicated situations arose because of that."
One royal expert has now claimed that the new Princess of Wales, Kate, has begun to upstage the new King and Queen, reports the Mirror.
Kate's appearance at the Chelsea Flower Show, which was unexpected, caused more of a stir than when Charles and Camilla visited hours later.
Royal expert Robert Jobson believes Charles is happy for Kate to "steal the limelight" as a popular member of the firm, now that he has finally ascended the throne.
He said: "Whilst it is Charles' head that wears the Crown, it is William, Catherine and their children that will steal the limelight. They are bound to. And it is right.
"This time, it will be with Charles's blessing – for he knows for monarchy to survive it must be relevant to the younger generation."
William and Kate have created a huge online presence after changing their Twitter and Instagram accounts, to help the royals move with the times.
There are now 'behind-the-scenes' videos from the couple's life, with several posted over King Charles' Coronation weekend.
One YouTube video even gave a sneak peek inside their Kensington Palace home, as they prepared for the Coronation.
However, royal correspondent Rebecca English said that while fans love the modern approach, there is still some concern from within Buckingham Palace about the best way to promote the monarchy.
She explained: "The Waleses have been looking at this for a while and they have really ramped it up since Easter - how do we tell our story to younger people and how do we engage them and show people what we are doing?
"Not just us as a family but the work we are doing and the difference we are trying to make whether it is homelessness, mental health, education, or the environment.
"One of the ways they have decided to do this is to be a bit slicker with their social media because that is how young people consume their news nowadays.
"Now the jury is still out a little bit on whether this is the right way to do it because these social media clips are almost too well put together.
"So the jury is still out amongst the wider royal household but there is support for them trying to engage people in a different way."
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