Chelsea Clinton and her husband Marc Mezvinsky on June 18A son was born. The wonderful news was shared by the mother of two herself, writing on Twitter: “Mark and I are overwhelmed with gratitude and love as we celebrate the birth of our son, Aidan Clinton Mezvinsky.” A little later, the daughter of Bill and Hillary Clinton posted a photo with the newborn on Twitter. At 7:41 AM Saturday, our family and hearts expanded with Aidans arrival. We are blessed. Chelsea Clinton (@ChelseaClinton) The happy grandparents – US Democratic presidential candidate Hillary Clinton and former US President Bill Clinton – a little later also made an official statement: “We are incredibly happy to be grandparents again with the arrival of our grandson, Aidan Clinton Mezvinsky, born Saturday, June 18, 2016. We are over the moon that Chelsea and Mark have welcomed Charlotte’s little brother, and appreciate all of your congratulations. Chelsea and Aidan are doing well and enjoying each other." Chelsea and Marc have a daughter, Charlotte, who will be two this fall. The grandparents were so moved when they first met Aidan that they both posted historic photos. First, Hillary. Jun 19 2016 at 1:38 PDT Then Bill. Aidan has made two dads very happy this Father's Day. Hillary and I are thrilled for Marc and Chelsea! Bill Clinton (@billclinton)