Princess Diana Had Unexpected Reaction To King Charles' 'Deadly Serious' Proposal - Report

Photo Credit: Bettmann / Contributor via Getty Images Princess Diana's reaction to King Charles' proposal was reportedly unexpected. The late royal shared her story with biographer Andrew Morton, who penned it in his 1992 book, "Diana: He True Story." In it, the mother of Prince William and Prince Harry shared that she initially found the now-king's proposal a joke. However, she soon realized the former Prince of Wales was "deadly serious" about it. Princess Diana thought King Charles' proposal was a joke, book claims Princess Diana reportedly assumed King Charles was joking . . .