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It's easy to brush off a famous person as someone with limited interests, but some celebs live double lives as straight-up geeks. Whether they have PhDs in neuroscience, are 'Star Wars' mega-fans, or have published academic papers, these A-listers are true brainiacs.

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▲The talk show host is a huge sci-fi addict, and has closely followed J.R.R. Tolkien's work and the 'Star Wars' saga. He even had a cameo in the 'The Hobbit: The Desolation of Smaug.'

▲The 'Friends' star has a bachelor’s degree in biology from Vassar College, in New York. She helped her father, who's a doctor, with his research on headaches for eight years.

▲The Oscar-winning actor is also a scientist! He has been credited as the co-author of an academic paper on human brains, as reported by the BBC.

▲The Oscar-winning actress is not only a Harvard University graduate, she has also been published twice on scientific journals and has an Erdős–Bacon number of 7.

▲Jerry Seinfeld geeks out over many things, including vintage cars and fellow comedians, but he is also a huge comic book fan. Superman was Seinfeld's favorite character in his hit sitcom.

▲The actress behind Dr. Amy Farrah Fowler didn't just play a neuroscientist on the hit show 'The Big Bang Theory,' she's one in real life, too! The actress has a PhD in neuroscience from UCLA.

▲The actress is a well-known fan of the video game 'World of Warcraft,' and her character's name was "Captainpicard"—Patrick Stewart's character in 'Star Trek: The Next Generation.'

▲The Swedish actor has a degree in chemistry from Washington State University, and a degree in chemical engineering from Stockholm’s Royal Institute of Technology. Plus, he did his masters in chemical engineering at the University of Sydney.

▲The Queen guitarist is actually an astrophysicist, with a PhD from Imperial College London. Dr. May was even a "science team collaborator" with NASA's New Horizons Pluto mission.

▲The late actor was a self-proclaimed gamer, anime, and comic books lover. He even named his daughter Zelda after the Nintendo Princess, and some of his favorite anime included 'Cowboy Bebop' and 'Ghost in the Shell.'

▲Biebs is not only a huge pop star, he's actually a bit of a nerd too. He's a big fan of the popular toy Rubik's Cube, and he's known for being able to solve the complicated puzzle in under two minutes.

▲Leo is an avid 'Star Wars' fan, and used to have a massive collection of figurines, which he ended up auctioning off in 2006 to raise money for his nonprofit environmental association. He's a good nerd!

▲It would be shocking if Harry Potter wasn't a nerd, right? He's such a 'Star Wars' fan, he even visited the set of 'The Force Awakens' and met his heroes, Harrison Ford and J. J. Abrams.

▲Fox was a big comic book reader growing up, and she also loves anime. It's no wonder she starred in 'Transformers' and the 'Teenage Mutant Ninja Turtles' live-action movies!

▲The actor is legally a geek. He changed his surname from "Coppola" to "Cage," after superhero Luke Cage. He also named his son "Kal-El," which is Superman's birth name.

▲Everybody knows Cindy Crawford as a hugely successful model, but did you know she was a major in chemical engineering in college? She got in with a scholarship, but dropped out to focus on modeling.

▲The 'Shazam' star is a video game lover, and he even hosted the 2011 Spike Video Game Awards. Levi is also the creator of The Nerd Machine, a website dedicated entirely to the nerd community.

▲As a major 'Star Trek' groupie, Dawson is a frequent presence at Comic-Con events. She even knows how to speak Klingon!

▲It might come as a bit of a surprise, but the actor is a huge fan of the board game Dungeons and Dragons, which he began playing as a teen.

▲Harvard graduate Rashida Jones is a straight-up geek. She even wrote her own comic book series, 'Frenemy of the State.'

▲Isaac is a self-confessed 'Star Wars' fan boy, who got to live out his wildest dreams when he starred in 'The Force Awakens.' He also loves comic books, particularly the 'X-Men' series.

▲As if being in 'Star Trek,' 'Star Wars,' and 'Doctor Who' wasn't enough to qualify as a total geek... Pegg also has a New York Times best-selling book, 'Nerd Do Well.'

▲The actress is known as The Queen of Geek. She's a video game addict, and she turned her passion into her career with the successful online video series 'The Guild.'

▲The actress got her bachelor's degree in math from UCLA, and has written several books to encourage children to get involved with mathematics, including 'Girls Get Curves: Geometry Takes Shape.'

▲Just before Simon & Garfunkel rose to stardom, singer Art Garfunkel was working on his doctorate in mathematics education at Columbia University.

▲The actor is a big-time nerd. From using science-fiction movie references in his comedy, to discussing comic books with his Twitter fans, to professing his love for 'Star Wars,' Oswalt is all over it.

▲The 'Heroes' star is a genius in real life. He was on the cover of Time magazine in the 1987 issue 'Those Asian-American Whiz Kids.' He graduated with a degree in computer science and mathematics from Brown University.

▲Cassidy played Black Canary in 'Arrow,' but she also engages in geeky activities in her free time. She loves to play video games, and she knows how to take apart a computer and put it back together again.

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The Offspring musician has a masters in molecular biology from the University of Southern California. While studying for his PhD in molecular biology, he dropped out because of the band's success.

Sources: (BBC)