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We have Classmates.com to thank for Fallon's epic photo, which puts the Tonight host's growing mustache on full display.
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Legend is truly ageless, proving that his high school self mirrors his present-day self in his cute yearbook pic.
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Before starring in Scary Movie and Mom, and marrying hunky star Chris Pratt, Faris was a student at Edmonds-Woodway High School in Washington.
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McCarthy has always been interested in fashion — particularly in high school, when the Oscar-nominated actress experimented with her style. "I was super preppy, and by the end [of high school] blue black hair that I'd shave in patches," she told Anderson Cooper on his talk show.
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Surprise, surprise: McConaughey's high school superlative ("Most Handsome") still rings true to this day.
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TARAJI P. HENSON
The Hidden Figures actress already had dreams of making it big in Hollywood as a high school student. "She knew she belonged in #Hollywood right here," Henson wrote on Instagram. "She just didn't know how she was getting there but she DREAMED BIG AF!!!"
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The 13 Reasons Why actress took it back to her junior year in high school, posting a throwback pic of herself on Twitter.
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Streep started acting while in high school, though her list of extracurriculars also included swimming and cheerleading.
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Chastain was unable to graduate from high school with the rest of her class after having what she described as a "difficult time," though she later earned her GED and went on to get a BFA from Juilliard.
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BILLY BOB THORNTON
Thornton graduated from Malvern High School in Arkansas in 1973. While attending school there, he lived in a house without electricity or running water with over 12 relatives.
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Fact: the Magic Mike actor continues to show off his signature megawatt smile in 2017.
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While attending University High School in Los Angeles, California, Bridges was a member of — go figure — the school's yearbook staff.
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Louis-Dreyfus' parents divorced when she was a child, and she consequently split her time growing up between New York City and Washington, D.C.
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Doesn't Stone resemble a young Jodie Foster here?
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The actress graduated from Patrick Henry High School, where she studied drama, in 1975.
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Clarkson was already well into her life as a singer by the time this photo was taken — by the time she was 10 or 11 years old, she told Reader's Digest, she had written her first song.
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Ryder graduated from California's Petaluma high school with an impressive 4.0 GPA.
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Pictured here in sixth grade in in 1988, Witherspoon was modeling and acting in commercials and had won the Ten-State Talent Fair at age 11.
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Davis started acting while attending Central Falls High School in Central Falls, Rhode Island.
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Pictured in sixth grade, Foxx — then known as Eric Bishop — had already been playing the piano for a decade at this point.
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"I remember having that unibrow, which I always hated," Fox, seen here in 1994 as a second-grader, told Allure of her elementary-school brows. "I used to beg my mother to let me pluck my eyebrows."
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Nolte studied at Westside High School in Omaha, Nebraska, where he was the kicker on the football team. He also attended the area's Benson High, but was expelled for fighting and underage drinking.
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Portman had to take some time off from attending Syosset High School in Long Island, New York to film Star Wars Episode I: The Phantom Menace.
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Like Portman, Carey also attended high school in Long Island.
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Urban was bit by the music bug pretty early — he was playing the guitar at age 6 and winning talent competitions while still in elementary school.
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Brooklyn-born Streisand attended Erasmus Hall High School in the borough's Flatbush neighborhood.
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Cube attended William H. Taft High School, in Woodland Hills, California, with his future NWA bandmate Eazy-E and House of Pain member Daniel "Danny Boy" O'Connor.
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Sarandon attended high school in Edison, New Jersey, in the 1960s.
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Another Long Islander, Seinfeld attended Massapequa High School.
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As you can see, Parton's always had a thing for big hair —"the higher the hair, the closer to God," it's often said.
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Pratt was well-liked at his high school in Lake Stevens, Washington. Not only was he a fullback for the football team, a state-qualifying wrestler, and a member of the track team, but he delivered his class's graduation speech.
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After being rejected for the Newbury Park High School cheerleading squad in California, Locklear tried at for drama club, where she fell in love with her eventual calling.
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Check out Leachman's vintage 1940s-era victory rolls.
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