Princess Diana’s younger brother, Charles Spencer, released his memoir "Swan Song," about the beloved royal this week revealing new details about the late royal’s life behind palace walls.From claims about then-Prince Charles’ treatment of Diana to an American politician who reportedly courted her after her divorce, here are some of the memoir’s biggest revelations.PRINCESS DIANA COULD HAVE SURVIVED FATAL PARIS CRASH IF SHE MADE ONE SIMPLE CHOICE, INVESTIGATOR SAYSFox News may be compensated for or earn a commission if you buy through our referral links."Swan Song" is out now.(Steinway)Spencer wrote that on the morning Diana died, then-Prince Charles sounded "giddily elated – like a lottery winner," he remembered thinking at the time.He wrote that Charles was "strangely matter-of-fact, given the enormity of the disaster."PRINCESS DIANA'S HONEYMOON LETTER REVEALS A YOUNG BRIDE 'PLAYING WITH GROWN-UPS' IN THE ROYAL FAMILYCharles Spencer wrote a memoir about his sister Princess Diana called "Swan Song." ( The Spencer Family; Tim Graham Photo Library via Getty Images)In hindsight, Spencer wrote, he believed that Charles’ first reaction to her death was that it likely freed him up to "marry the woman he loved, rather than appreciating the loss of one he did not."He also wrote that while they were arguing over funeral arrangements, Charles told him, "Rest assured … we'll forget her soon enough!"PRINCE HARRY'S RUMORED DIANA FILM 'MIGHT FEEL LIKE ANOTHER BETRAYAL' TO PRINCE WILLIAM AS RIFT GROWS: EXPERTSpencer said he was stunned for a few seconds before responding, "I can’t believe you just said that," before hanging up.Earlier in their conversation, Spencer wrote that Charles accused the Spencer family of having no sense of duty because Spener had objected to Princes Harry and William walking behind their mother’s coffin.A photo of Princess Diana and Charles Spencer smiling together as kids.
(Central Press/Getty Images)PRINCESS DIANA NEVER FORGAVE SARAH...