Chelsea Clinton announced the birth of her son the Aidan Clinton Mezvinsky late Saturday morning on Twitter.

Chelsea Clinton Gives Birth To Son

“Marc and I are overwhelmed with gratitude and love as we celebrate the birth our son, Aidan Clinton Mezvinsky,” Clinton tweeted.

Clinton, 36, announced her second pregnancy in late December, and has reportedly been campaigning on behalf of her mother, presidential candidate Hillary Clinton. She is also on the board at her family’s foundation.

Clinton married Mezvinsky, 39, in 2010 — he is a fellow Stanford alumnus and his parents, Edward and Marjorie, both served in Congress.

In a statement, Bill and Hillary say they are overjoyed and “grateful for our many blessings.”

Aidan joins his sister Charlotte, who turns two on Sept. 26.

Read more about: