The "Therefore I Am" singer revealed that she wasn't always such a "Bad Guy" in December 2020. Eilish shared an adorable baby picture on her 19th birthday on December 18. Little Billie wore a chic baby bucket hat, proving that she was born with a keen sense of style and a dirty mouth! The trendsetting singer was born and grew up in Los Angeles so she has always been close to Hollywood... but she did it her own way!

We are hoping to see more of baby Billie in the upcoming Apple TV documentary, "Billie Eilish: The World's A Little Blurry."

Gal Gadot was a cute kid who grew up to be one of the greatest superheroes ever to grace the big screen. While the star became a household name by portraying Wonder Woman but she has a long and interesting history. She was born in Tel Aviv, Israel where she studied Jazz and Hip Hop dancing before getting into acting. Her first breakthrough role in American cinema came in the form of one of Dominic Toretto's crew in "The Fast and The Furious." She's been dubbed the "biggest Israeli superstar" by media outlets!

Turns out that Chris Hemsworth wasn't always so muscular but he has always been super blond! The "Thor" actor shared an adorable picture of his much, much younger self with his mother on May 14, 2017, for Mother's Day. "Love u mum." Chris captioned her sweet post (that's how they spell mom down under). The ripped father of three grew up in Melbourne, Australia but now raises his kids up the coast in Byron Bay. He loves to take his kids on camping trips, just like the ones his mum took him on.

The "Meant To Be" singer was meant to be a star but thankfully she got a new hairstylist when she grew up! Bebe Rexha showed off her childhood photos on social media in April. The pop star is very proud of her Albanian roots and explained that the photos were taken in the motherland. "Throwback to this short haircut I got on my trip to Albanian swipe to see how long my hair was before it was chopped off. 😭 🇦🇱🇦🇱🇦🇱" she captioned her post. Check out her long hair here!

What could we say about Britney that you don't already know! Regardless, she was an adorable child with a contagious smile. She was born in McComb, Mississippi and sang in the church choir as a kid. She went on to be one of the biggest pop stars in the world. She's also tons of fun to follow on social media... it's just hard to figure out what she's talking about!

Even though Kylie Jenner practically grew up on camera due to the popular reality show, "Keeping Up With The Kardashians," it's still to check out the self-made billionaire when she was a cute kid. Jenner was feeling nostalgic way back in 2018 and shared some sweet throwbacks a few hours ahead of her 21st birthday via her Instagram story. It's crazy to see how much Kylie has grown up! Who knew that the little girl pictured above would grow up to be the highest-earning celebrity of 2020!