Fifty years ago Marilyn Monroe sang a sultry version of "Happy Birthday" for President Kennedy during his birthday party at Madison Square Garden. It has since become the gold standard of the tune. Despite Monroe’s provocative delivery, nothing was ever written about a possible affair in the papers at the time. Only after both passed away did the speculation mount. In 1999, the skintight dress Monroe wore that night was auctioned off for $1.26 million.