Chelsea Clinton may be gearing up to welcome Baby No. 2, but it seems her 19-month-old daughter, Charlotte, isn't quite ready for a new sibling!

“I think she has no idea. We talk to her a lot about the fact that she’s going to become a big sister, and thankfully there are these wonderful books that are clearly written to explain what it means to become a big sister," the 36-year-old pregnant former first daughter revealed in a recent interview with Access Hollywood.

“[But], she really doesn’t understand, because every time we get to the part where the new baby comes, [Charlotte] goes, ‘Baby!’ and points to herself," Chelsea added.

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Chelsea and her husband, *Marc Mezvinsky *, 38 — who married in July 2010 — welcomed Charlotte in September 2014 and announced they are expecting their second child in December 2015.

During her Sunday, April 3 interview with Access Hollywood, Bill Clinton and Hillary Clinton's daughter additionally gushed about how great her parents are with granddaughter Charlotte.

“It’s been such a joy for me to watch my parents as grandparents. I didn’t know that was a gift that Charlotte would give me. Watching them be so loving and invested in every part of her life and wanting to know every day what she’s up to and how she’s doing… It is so heartwarming," Chelsea said.