Princess Diana and Prince Charles have received very different treatments from the royal family ever since they started dating. But the differences became glaring during the couple’s wedding day.

In the Channel 5 documentary “Charles and Di: The Truth Behind Their Wedding,” American businesswoman Mary Robertson revealed that Princess Diana was only allowed to invite 100 guests to her big day. Prince Charles, on the other hand, had thousands of guests at St. Paul’s Cathedral in London.

“When we arrived at St. Paul’s, we walked up to the steps, red-carpeted, and I said, ‘I bet we’re going to be at the back of the cathedral, behind a pillar.’ But they just kept walking us up and up and up to eight or ten rows back,” she said.

Princess Diana worked for Robertson as the latter’s son’s nanny. Robertson paid the Princess of Wales a small sum of money per hour to look after her child. Even after Princess Diana joined the royal family, she and Robertson stayed in touch.

According to the businesswoman, even though she and her companions were sat at the far end of the chapel, they actually occupied the same row as Margaret Thatcher.

“We learned later Diana had only been allowed 100 invitations out of 2,000, but again bless her, she remembered us,” Robertson said.

Robertson saw Princess Diana walking the down the aisle on her wedding day and she said that even under her veil, it was evident that the late royal didn’t look happy. Rather, the mom of two looked tense and nervous.

“There was this wonderful buzz, it was just unadulterated joy and happiness, apart from the handful who really understood what was going on,” she said.

Royal expert Christopher Wilson revealed that just before the couple tied the knot, Princess Diana found Prince Charles’ farewell present to Camilla. But even after the incident, the Princess of Wales still decided to push through with her wedding.

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Britain's Princess of Wales arrives at her London health club. Johnny Eggitt/AFP/Getty Images)