Sir Rod Stewart's sang 'awful' in front of the Duke and Duchess of Cambridge at this year's Royal Variety Performance.ITV viewers slammed the 76-year-old's performance of One More Time on Sunday evening.The event was hosted by comedian Alan Carr and had Prince William and wife Kate in attendance sitting in the royal box.Viewers were quick to take to social media after Rod took to the stage.One wrote: "That was AWFUL sir!#RoyalVarietyPerformanceAnother said: "@ITV anyone else just had third party embarrassment watching Rod Stewart?
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