Chelsea Clinton turns 44: a look back (27 images)

Clinton poses for pictures at the premiere of "The Day After Tomorrow" at the American Museum of Natural History in New York on May 24, 2004. Photo by Laura Cavanaugh/UPI

Clinton addresses Washington University students at a nearby coffee shop, stumping for her mother during Sen. Clinton's presidential campaign in St. Louis on January 28, 2008. Photo by Bill Greenblatt/UPI

Chelsea joins her mother on stage at the Columbus Athenaeum in Columbus, Ohio, on March 4, 2008 during Sen. Clinton's presidential campaign. Photo by Archie Carpenter/UPI

Clinton listens as her father speaks during the opening plenary session of the sixth annual meeting of the Clinton Global Initiative on September 21, 2010 in New York. Photo by Monika Graff/UPI