Chelsea Clinton Gives Birth To Second Child

Hillary Clinton is now a grandmother of two.

Clinton's daughter, Chelsea, announced on Twitter Saturday that she and husband Marc Mezvinsky were celebrating the birth of a son, Aidan Clinton Mezvinsky. Their daughter, Charlotte, was born in 2014.

Bill and Hillary Clinton issued a celebratory statement soon after:

Clinton speaks frequently about being a grandmother on the campaign trail. She has babysat, helped changed diapers and sings "the wheels on the bus" to her granddaughter.

"There's just nothing better" than being a grandparent, Clinton told People magazine in January. "I'm experiencing sort of what my mother experienced with Chelsea, because you're so focused on just enjoying and marveling and loving to the Nth degree but you also have this perspective like, 'Oh my gosh, I want to make sure that the world is okay and that, you know, things are right, and we have to save the planet.'"