Chelsea Clinton announces birth of second child
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Chelsea Clinton, daughter of presumptive Democratic presidential nominee Hillary ClintonHillary Diane Rodham ClintonBroadway play 'Hillary and Clinton' closing early due to low ticket sales Broadway play 'Hillary and Clinton' closing early due to low ticket sales Facing challenge from Warren, Sanders touts strength against Trump MORE and former President Bill ClintonWilliam (Bill) Jefferson ClintonBroadway play 'Hillary and Clinton' closing early due to low ticket sales Broadway play 'Hillary and Clinton' closing early due to low ticket sales Campaign dads fit fatherhood between presidential speeches MORE, announced Saturday the birth of her second child, Aidan Clinton Mezvinsky.

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Bill and Hillary Clinton are thrilled to be grandparents again, they said in a statement.

"We are all over the moon as Chelsea and Marc welcome Charlotte's little brother to the world and grateful for our many blessings," their statement read. "Chelsea and Aidan are both doing well and enjoying this very special time together."

Clinton frequently mentions the joys of being a grandmother on the campaign trail and cited the birth of her first grandchild, Charlotte, as her inspiration for seeking the presidency again. 

"Having this wonderful little person in your life makes you think about the future in a whole new way," Clinton told "Us Weekly" in April. "Being a grandmother is the most amazing experience."

Chelsea gave birth to Charlotte in 2014.