Popsugar Celebrity Jackie Kennedy Jackie Kennedy Onassis Facts 15 Things You Might Not Have Known About Jackie Kennedy Onassis 25 July 2018 by Kelsie Gibson View On One Page Photo 1 of 15 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 1 She Was the First FLOTUS Born in the 20th Century Jackie was born on July 28, 1929, in Southampton, NY, making her the first first lady to be born in the 20th century. Previous Next Start Slideshow Jackie KennedyCelebrity Facts