Chelsea Clinton is pregnant again! The 35-year-old former First Daughter announced earlier today that she is expecting her second child with husband Marc Mezvinsky. "Next summer, Charlotte is going to be a big sister!" she tweeted alongside an adorable photo of her daughter reading a book titled "Big Sisters Are the Best." "Feeling very blessed & grateful this holiday season."

Her mother, former Secretary of State Hillary Clinton, quickly took to Twitter to respond to the exciting news. "Your dad and I could not be happier for you, Marc and Charlotte. We're so excited to meet our second grandchild!" she wrote. Shortly after, her father, former President Bill Clinton, also responded on social media. "Christmas comes early!" he tweeted. "@HillaryClinton and I are thrilled for Chelsea, Marc and Charlotte's growing family in 2016!"

In a Facebook post, Chelsea also added, "Being Charlotte's parents has been the most joyous, meaningful and loving experience of our lives and we are very excited about growing our family in the new year."

Back in October, Chelsea gushed about her own mother, who is currently running for president, while on "The Ellen DeGeneres Show" and spoke about how becoming a mother herself has made her respect her mom so much more.

"I didn't know that I could love and admire and respect my mom anymore until I became a mom and couldn't believe any more in her as the right leader for the country I want my daughter to grow up in," said Chelsea. "But I do because she has been working to ensure that every woman should get the chance to grow up to be you or to grow up and be the next Hillary Clinton."

See the tweets from Chelsea, Hillary and Bill below.

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