Prince William was terrified of making a mistake on the eve of his wedding to Kate Middleton in 2011.

The Duke of Cambridge admitted he feared fluffing his lines to the eager crowds that had gathered in The Mall ahead of the £25million ceremony at Westminster Abbey the following day.

And he had every reason to be nervous.

Two decades earlier, his mum Princess Diana famously got Prince Charles' name muddled up at the altar, accidentally calling him "Philip Charles" instead of "Charles Philip".

Charles, meanwhile, also made a similar gaffe on the day, saying "thy goods" rather than "my worldly goods".

Luckily for the Wills and Kate, who celebrate their 10th wedding anniversary today on April 29, this time around the groom held his nerve to reel off his lines without a hitch.

But not everything went according to plan.

In fact, there was great concern when it came to slipping the wedding ring on to Kate's finger.

William repeatedly tried to get it on, but the band of Welsh gold refused to budge.

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After several intense moments of panic, the duke eventually managed to place it on Kate's wedding finger.

It was one, unscripted moment in a ceremony that proved the perfect marriage between royal pomp and circumstance and the sort of country weddings Kate and William are now so used to, the Mirror reports.

William and best man Harry arrived early and chatted to family and friends in the congregation before slipping off to St Edmund’s Chapel to wait for Kate.

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Then, as she walked down the aisle at 11am, William stared dutifully ahead at the altar – but Harry turned and sneaked a look before telling his anxious brother: “Well, she’s here now – and she looks beautiful, I can tell you that!”

And when he finally set eyes on her, William’s eyes lit up. Kate held his gaze and smiled as he whispered how beautiful she looked. Then, with typical humour, the down-to-earth prince leaned towards Kate’s nervous father and joked: “We are supposed to have just a small family affair!”

You could hear a pin drop as family, friends and guests waited to hear if Kate got William’s names wrong – like Diana had with Charles – or if he’d forget to share all his worldly goods with her.

William’s voice was clear and strong but Kate’s was barely a whisper as she struggled to contain her emotions. Then, ring finally in place, the Archbishop pronounced them husband and wife.

The silence was broken by a roar, sweeping in from the crowds listening on speakers outside.

It was the perfect reminder, if one was needed, of how Kate and William have captured the nation’s hearts and begin their married life on a tidal wave of affection.

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