Grandpa Bill and grandma Hillary Clinton are expressing their happiness over the birth of their grandchild.
Chelsea Clinton welcomed Charlotte with husband Marc Mezvinsky yesterday.
NEWS: Chelsea Clinton Gives Birth to Baby Girl
Today Secretary Clinton tweeted out this photo of her former President husband with her and their new granddaughter.
Bill also joined in on the tweeting.
In a statement, Bill and Hillary say, "We are blessed, grateful, and so happy to be the grandparents of a beautiful girl, Charlotte Clinton Mezvinsky, born on Friday evening, September 26, 2014. We are thrilled to be with our daughter and her husband as they welcome their daughter into the world. Chelsea is well and glowing. Marc is bursting with pride. Charlotte's life is off to a good start."
NEWS: Chelsea Talks Her Parents' Pressure To Have Kids
Their 34-year-old daughter shared her own family photo.
This is the first child for Chelsea and Marc, 36. The couple married in 2010.
Watch the video below to see the stars who attended the Clinton Global Initiative.