Kim Kardashian has a little Jackie Kennedy on her -- because we found out she secretly bid on and won one of the legendary First Lady's super-expensive timepieces. Auction sources tell TMZ Christie's expected the watch to pull in $120,000 ... but Kim's anonymous, winning bid was $379,500!
Jackie's Cartier watch must have been acquired when she was First Lady -- just months before JFK was assassinated. It's engraved February 23, 1963. She got it as a gift from brother-in-law Prince Stanislaw "Stas" Radziwill.