It's a girl for former first daughter Chelsea Clinton.
She gave birth to a daughter of her own on Friday.
"Marc and I are full of love, awe and gratitude as we celebrate the birth of our daughter, Charlotte Clinton Mezvinsky," read a Twitter message posted by Clinton just after midnight on Saturday.
It is the first child for Clinton and her husband, Marc Mezvinsky.
It is also the first grandchild for former President Bill Clinton and former Secretary of State Hillary Rodham Clinton, who have eagerly been waiting for the baby to arrive.
The proud parents waited until the baby was born to find out its gender.