When Kate Middleton stepped out of that Rolls Royce on her wedding day in 2011, all eyes were on the blushing royal bride.
Dressed in a white and ivory gown by Sarah Burton at Alexander McQueen, the then 29-year-old looked every inch a princess-to-be, but according to a royal expert there was a moment before the big day that resulted in tears.
The now Duchess of Cambridge, like any bride, wanted to keep the big reveal of her dress a secret, but over a month before the nuptials, the Sunday Times discovered who would be designing Kate's wedding gown.
Speaking on the Channel 5 documentary Secrets of the Royal Dressmakers, royal correspondent Katie Nicholl revealed: "Behind the scenes I think that caused tears at the Palace because Kate had done everything she could to keep the wedding dress a secret."
Thankfully, no details about the design itself were revealed and to this day the Victorian-inspired frock remains an iconic outfit.
According to the Palace, Duchess Catherine chose British brand Alexander McQueen for "the beauty of its craftsmanship and its respect for traditional workmanship and the technical construction of clothing."
The royal bride wanted that mix of tradition and modernity and was revealed to have worked closely with designer Sarah Burton on the dress.
"I had no idea it would be as big as it was," the fashion designer told The New York Times Style Magazine back in 2014.
"Only the night before, seeing all the photographers outside the abbey, did I think, 'Oh, my God. This is massive.'"
The day was a roaring success with foreign dignitaries and celebrities alike coming together to watch Prince William and his bride exchange vows.
When Prince William placed the ring on Kate's finger, however, there was an awkward moment when it wouldn't fit, but royal correspondent Katie Nicholl explained that the bride had reportedly asked ring designer Wartsk to make it a size smaller so it didn't slip off.
WATCH BELOW: Prince William and Duchess Catherine exchange wedding vows. Post continues after video...
"She had her engagement ring resized because she'd lost weight and didn't want the same problem with her wedding ring slipping off," she explained in a report for the Mail on Sunday in 2011.
"It has now become a subject of amusement to her and William."