Chelsea Clinton has announced that she and her husband are expecting their first child this year - as her parents, the former and possibly future presidents, prepared to become grandparents.
"I just hope that I will be as good a mom to my child and hopefully children as my mom was to me," said Clinton, as her mother, former secretary of state Hillary Clinton, looked on proudly. A Clinton spokesman said the baby was due this autumn.
The pregnancy coincides with Hillary Clinton's deliberations about a second presidential campaign in 2016, when she would be the overwhelming favourite for the Democratic nomination.
Thursday's announcement came at the conclusion of a forum, moderated by actress and activist America Ferrera, promoting young women's empowerment.
"I certainly feel all the better - whether it's a boy or girl - that she or he will grow up in a world full of so many strong, young female leaders, so thank you for inspiring future generations, including the one that we'll be lucky enough to welcome into our family later this year," Chelsea Clinton said.
As Clinton spoke, her mother beamed from the stage. She said she was "really excited" to be expecting her first grandchild and later tweeted: "My most exciting title yet: Grandmother-To-Be!" Former president Bill Clinton tweeted: "Excited to add a new line to my Twitter bio … grandfather-to-be!"
Chelsea's announcement came as a surprise to some senior Clinton staff working at the event, but there was one sign she had decided that she wanted to break the news there. Midway through the event, Mezvinsky, a hedge-fund manager, quietly walked into the room through a back door to watch Chelsea share their secret.