It's hard to believe it's been 40 years since Princess Diana and John Travolta took a romantic spin at the White House in 1985, but that 15 minutes of magic stunned onlookers, went down in history and sparked an undeniable fire between the dazzling duo. Knewz.com can now reveal it was only the tip of the iceberg of their sizzling bond. "I know for a fact that it was a highlight of being in the United States – it was her favorite moment," recalled Travolta, 71, of the memorable night. At just 24