Kate Middleton is 'the glue' when King Charles, Prince William 'don't see eye to eye': expert

After battling cancer and watching her father-in-law fight the disease while completing royal duties, Kate Middleton has one thing to look forward to – her 43rd birthday.

On Thursday, the Princess of Wales will celebrate the special day privately with her loved ones, as the public praises the royal for being the British monarchy’s shiniest jewel. But the future queen consort has already proven herself to be a valuable asset to "The Firm," several royal experts told Fox News Digital.

"King...