Kate Middleton, Prince William have King Charles blessing to take centre stage

Prince William and his wife Kate Middleton have been allowed to remain in the spotlight because King Charles III knows the couple will "save monarchy", according to a royal expert.

The newly crowned King, 74, will give "blessing" to his eldest son William and daughter-in-law Princess Kate to 'steal the limelight' in order to prosper the Firm as he focuses on his duties as monarch.

Royal commentator Robert Jobson rubbished the claims that the King was "disappointed" after his visit to the annual Chelsea Flower Show was "overshadowed" by a surprise appearance by the Princess of Wales.

The expert said it was "right" that Prince and Princess of Wales and their brood took centre stage if the monarchy is going to "survive".

"Speculation that Charles is concerned that his son and daughter-in-law are stealing his thunder is wide off the mark," Jobson wrote for MailOnline.

"Make no mistake, whilst it is Charles's 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," the expert added.

Charles and Camilla toured the grounds and the pair presented the first medals in the Garden of Royal Reflection and Celebration to three lucky recipients. Meanwhile, the Princess of Wales also made a surprise appearance at the first-ever Chelsea Children's Picnic. The separate visits gave rise to rumours that Kate had stolen the King's thunder as he received "less coverage" than he had hoped.

But, royal expert has rejected all such reports, saying Kate, William and their kids have the blessing of king Charles to prosper monarchy by attracting the limelight as people love to see them.