Princess Diana went to her grave ashamed of how she looked and felt during the christening of her first son, Prince William – confessing the day "couldn't have been worse" and left her feeling like an afterthought in the ceremony, RadarOnline.com can reveal.

The event took place at Buckingham Palace on August 4, 1982, just six weeks after William's birth on June 21. Article continues below advertisement

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Though it marked an important milestone for the heir to the throne, Diana – then only 21 and barely a year into her marriage to Prince Charles – was already struggling with postpartum depression and isolation.

"She

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