18 celebrities you probably didn't know were Girl Scouts

The Girl Scouts are as American as apple pie and baseball. The organization began on March 12, 1912, and has been a staple of US culture ever since.

Today, there are 1.8 million Girl Scouts across the country who have all promised, according to Girl Scout Law, to be "honest and fair, friendly and helpful, considerate and caring, courageous and strong, and responsible for what [they] say and do."

Among those who have sworn this same promise are former First Ladies Hillary Clinton and Michelle Obama, successful actresses such as Gwyneth Paltrow, and the legendary tennis-playing sisters Venus and Serena Williams.

We spoke with the Girl Scouts who shared their 18 most famous alumni with us. 

SEE ALSO: 6 times Girl Scouts have made the world a better place

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Taylor Swift is potentially the most famous singer on the planet right now, but she once was a kid in Wyomissing, PA, who loved Caramel Delites.

Before Swift moved to Nashville for her music career, she grew up on a Christmas tree farm in the small town of Wyomissing, PA.

She mentioned her favorite Girl Scout cookie, Caramel Delites, in her rap parody "Thug Story."

Katie Couric isn't shy about her history as a Girl Scout — she even recently donned a vintage uniform.

The broadcasting icon wrote on her blog that her mom came up to visit her in New York City and "brought with her a bunch of old photos, including one of me in the fourth grade wearing my Girl Scout uniform."

She went on to say that "Women in business and government have come a long way since I took the Girl Scout pledge, and maybe, to quote 'Dirty Dancing,' 'nobody puts baby in a corner' anymore — or calls us 'baby' for that matter."

YouTube CEO Susan Wojcicki has been called the "most powerful woman on the internet." She's surrounded herself with powerful women since being a Girl Scout in Stanford, CA.

Wojcicki became the CEO of YouTube in February 2014 — a year later, she was named the "most powerful woman on the internet" by TIME.