Chelsea Clinton & Ivanka Trump Are Basically Besties Despite Their Parents' Rivalry

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Should it come down to Hillary Clinton versus Donald Trump in the 2016 presidential election, it could put on a strain on an unlikely friendship.

"Ivanka and I talk about everything," Chelsea Clinton told ET's Kevin Frazier of Trump's eldest daughter. "I'm so grateful she's my friend. I think she's a great woman, and I support her as I support all my friends."

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Donald has called Hillary "the worst secretary of state in history" and Hillary has described Donald's actions as "offensive" and "outrageous," but the mudslinging from the campaign trail doesn't seem to have crossed over into their children's friendship, which has grown over the years.

If you take their parents' political situation out of the equation, the two have a lot in common. They're both new moms in their thirties who live in Manhattan and hold big roles in their respective family businesses.

Ivanka, 33, has two children, one-year-old son Joseph and four-year-old daughter Arabella, with her investor husband Jared Kushner. Meanwhile, Chelsea, 35, had her first child, daughter Charlotte, with her investment banker husband Marc Mezvinsky on September 26 of last year. Ivanka is also a top executive at the Trump Organization while Chelsea maintains a prominent position at the Clinton Foundation and Clinton Global Initiative.

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While their parents' bad blood hasn't transferred, their toughness certainly has, which could prove useful as the campaign heats up. Chelsea credited her parents for her ability to not feed into negativity.

"We had mock debates," Chelsea said. "My mom, my dad and I would play different characters. Sometimes I would play my dad. Sometimes I would play his opponent. It helped me understand how to make an argument, to advocate for whatever I really cared about and it also helped me develop thick skin."

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And as her parents helped teach her how to advocate for worthy causes, Chelsea is trying to do the same for today's youth. Her new book, It's Your World: Get Informed, Get Inspired & Get Going!, available now, aims at getting young people involved with issues that interest them.

"I hope that it helps kids who read the book really be inspired to engage with whatever it is they feel most passionately about," Chelsea said. "Because I believe that with a little information kids can make a difference."