Inside Mom-to-Be Chelsea Clinton's World
04/25/2014 AT 08:40 AM EDT
After casually blowing up Twitter – Jenna Bush Hager quickly sent well wishes, while others crowed about an American royal baby – Clinton dashed to the premiere of the documentary Of Many, on which she served as executive producer.
She then cohosted an afterparty downtown, and finally sat down to a quiet dinner at ABC Kitchen in N.Y.C.'s Flatiron district with Mezvinsky, 36, and her parents, Hillary and Bill Clinton.
"Chelsea's a machine. She's super-efficient," says Jen Lee Koss, a former roommate at Oxford. Koss got the baby news from her friend in person and says, "It was extremely emotional – lots of hugging."