'Our family and hearts expanded with Aidan's arrival. We are blessed': Chelsea, Hillary and Bill all post adorable Twitter pictures of Sunday cuddles with the latest addition to their family

Hillary Clinton visited her newborn grandson, Aidan, on Sunday. The aspiring president and former president Bill both posted adorable pictures holding baby Aidan just a day after his world debut. 

Chelsea Clinton gave birth to her second child with Marc Mezvinsky on Saturday morning. Their daughter and first child Charlotte was born in September of 2014. On Sunday, Chelsea tweeted the first photo of her and Marc gazing lovingly at Aidan (right). She added the caption: 'At 7:41 AM Saturday, our family and hearts expanded with Aidan's arrival. We are blessed.' Hillary Clinton then tweeted a photograph of her, Bill and Aidan (left). And Bill tweeted a photo with Aidan and Marc in honor of Father's Day. Bill and Hillary (inset) strolled out of New York's $1,700-a-night Lenox Hill Hospital after their visit with baby Aidan and headed back to Chelsea's apartment.