Chelsea, Daughter of Bill Clinton gives birth to a Baby boy. Chelsea is Mom again

Clinton is the only child of U.S. Democratic presidential candidate Hillary Clinton and former president Bill Clinton.

Chelsea Clinton and her husband Marc Mezvinsky announced on Saturday the birth of their second child, a son named Aidan.

"Marc and I are overwhelmed with gratitude and love as we celebrate the birth of our son, Aidan Clinton Mezvinsky," Clinton said on Twitter.

The couple has a daughter, Charlotte Clinton Mezvinsky, who was was born in 2014.

Clinton is the only child of U.S. Democratic presidential candidate Hillary Clinton and former president Bill Clinton.

The 36-year-old Clinton, who announced her second pregnancy in late December, has been campaigning on behalf of her mother, presumptive Democratic presidential nominee Hillary Clinton. She is also on the board at her family's foundation.

She married Mezvinsky, 39, in 2010. He is also a fellow Stanford alumnus and the scion of a political family. His parents, Edward and Marjorie, both served in Congress

In a statement, Aidan’s grandparents say they are overjoyed and “grateful for our many blessings.”

Aidan is the second baby to be born to the child of a presidential candidate this year.

In March, presumptive Republican nominee Donald Trump’s daughter Ivanka gave birth to her third child, son Theodore James.

Democratic presidential candidate Bill Clinton, center, is hugged by his wife Hillary, left, and kissed by his daughter Chelsea, right, after the final presidential debate on Oct. 19, 1992. David Ake, AFP/Getty Images

Democratic presidential candidate Bill Clinton, center, is hugged by his wife Hillary, left, and kissed by his daughter Chelsea, right, after the final presidential debate on Oct. 19, 1992. David Ake, AFP/Getty Images

President Bill Clinton and daughter Chelsea go for a horseback ride at the J.Y. Ranch on Aug. 21, 1995, outside Jackson, Wyo. Doug Mills, AP

From left: Chelsea Clinton, President Clinton and Hillary Clinton get splashed by water as they run the Big Kahuna Rapids during a raft trip on the Snake River near Alpine Junction, Wyo., on Aug. 17, 1996. Ed Andrieski, AP

Chelsea Clinton marries Marc Mezvinsky on July 31, 2010, in Rhinebeck, N.Y. Genevieve De Manio, AFP/Getty Images

Former president Bill Clinton, right, and his daughter Chelsea Clinton, left, wave to greet the crowd as they attend the official memorial ceremony for late South African president Nelson Mandela at FNB Stadium in Johannesburg, South Africa, on Dec. 10, 2013. Dai Kurokawa, EPA

Bono and Chelsea Clinton sit in the front row at Edun at Mercedes-Benz Fashion Week Fall 2014 on Feb. 9 in New York City. Vivien Killilea, Getty Images

Chelsea Clinton, vice chair of the Clinton Foundation, speaks during a student conference for the Clinton Global Initiative University at Arizona State University in Tempe, Ariz. Matt York, AP

Former secretary of state Hillary Rodham Clinton shares the stage with her daughter, Chelsea Clinton, while speaking at the Clinton Foundation's No Ceilings: The Full Participation Project at the Lower Eastside Girls Club on April 17 in New York City. Spencer Platt, Getty Images

Chelsea Clinton and her family are seen leaving Lenox Hill Hospital in New York on September 29, 2014, with her newborn baby Charlotte Mezvinsky. Lenny Abbot, Splash News

Chelsea Clinton, vice chair of the Clinton Foundation, addresses the audience at the launch of ServiceNations's "Serve A Year" campaign at the El Capitan Theatre on March 23, 2015, in Los Angeles. The initiative aims to inspire young Americans to serve a year of national service in their communities following high school or college. Chris Pizzello,Invision/AP

Chelsea Clinton, the daughter of Democratic presidential hopeful Hillary Clinton, campaigns for her mother at Denizens Brewing Company in Silver Spring, Md. on April 21, 2016. Mandel Ngan, AFP/Getty Images

Former President Bill Clinton, Marc Mezvinsky and Chelsea Clinton greet Democratic presidential candidate former Secretary of State Hillary Clinton during a primary night event on June 7, 2016, in Brooklyn, New York. Hillary Clinton surpassed the number of delegates needed to become the Democratic nominee over rival Bernie Sanders with a win in the New Jersey presidential primary. Justin Sullivan, Getty Images

Chelsea Clinton Mom again Clinton Daughter gives birth Clelsea Clinton