FILE - This June 23, 2014, file photo shows Chelsea Clinton as she speaks at the Colorado Museum of Nature and Science, in Denver. Clinton announced the birth of daughter Charlotte Clinton Mezvinsky, 1st grandchild of Bill Clinton and Hillary Clinton, Saturday Sept. 27, 2014.  (AP Photo/Brennan Linsley, File)

Chelsea Clinton gives birth to baby girl

Chelsea Clinton, the daughter of the former president and ex-secretary of state, announced the baby's birth on Twitter and Facebook early Sa…