• Share
  • Tweet
  • Share
Bill Clinton, Hillary Clinton, Chelsea Clinton

Ramin Talaie/Bloomberg via Getty Images

Bill Clinton and Hillary Clinton are arguably the most excited grandparents-to-be around.

Chelsea Clinton's proud parents took to Twitter to adorably express their joy about their daughter's pregnancy.

"Excited to add a new line to my Twitter bio...grandfather-to-be!" the 42nd president tweeted on Thursday. He added: "@h and I are so happy for Chelsea and Marc!"

The former secretary of state wrote: "My most exciting title yet: Grandmother-To-Be! and I are thrilled that Chelsea and Marc are expecting their first child!"

Chelsea Clinton

AP Photo/Ted Shaffrey

The glowing 34-year-old announced on Thursday in New York City that she and husband Marc Mezvinsky are expecting their first child. She broke the exciting news during a joint event with her mother for the Clinton Foundation's "No Ceilings: The Full Participation" project.

"I have one more thing to say very quickly," the former first daughter said near the conclusion of the event. "I just want to thank all of you for being such an inspiration to us and to me in particular. Marc and I are very excited that we have our first child arriving later this year."

"And I certainly feel all the better, whether it's a girl or a boy, that she or he will grow up in a world with so many strong, young female leaders," she said.

Chelsea Clinton, Marc Mezvinsky

Frazer Harrison/Getty Images

Clinton also took to Facebook and Twitter, writing, "Marc and I are so thrilled to be expecting our first child in the fall! Thank you for all of the kind words!"

Besides Hillary and Bill, several other celebrities offered their well-wishes for the couple.

Clinton and Mezvinsky tied the knot in June 2010.

Congrats again to the entire family!