The Clintons welcomed the newest addition to their family, sharing family photos of Chelsea Clinton’s new son on social media Sunday.
"At 7:41 AM Saturday, our family and hearts expanded with Aidan’s arrival. We are blessed," Chelsea Clinton tweeted.
She announced the birth of her second child on Twitter on Saturday.
“Marc and I are overwhelmed with gratitude and love as we celebrate the birth of our son, Aidan Clinton Mezvinsky.”
Presumptive Democratic candidate, and grandmother, Hillary Clinton said she was "grateful."
“What a joy being with our new grandson, Aidan. So grateful,” she tweeted with a photo of her holding the baby as Former President Bill Clinton looks on.
Bill Clinton also took to Twitter, saying: “Aidan has made two dads very happy this Father's Day. Hillary and I are thrilled for Marc and Chelsea!”
Chelsea Clinton and Mezvinsky have a daughter, Charlotte, who was born in September 2014.