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Nolan Gould - Luke Dunphy from 'Modern Family' is certainly not the sharpest tool in the shed. He is adorable, but in a clumsy way.

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Nolan Gould - The actor who portrays him, on the other hand, is a real-life genius. He graduated from high school at 13 and is a member of the prestigious MENSA, an organization for people with extraordinary IQs.

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Ariana Grande - Grande had her break playing Cat Valentine, the airhead drama queen in the Nickelodeon TV series 'Victorious.'

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Ariana Grande - In real life, Grande has a fierce personality, which shows in her growing involvement in social activism.

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Taylor Momsen - Jenny from 'Gossip Girl' is a pretty girl who will do anything to impress her pretty friends.

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Taylor Momsen - Momsen, on the other hand, is lead singer of the rock band The Pretty Reckless.

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Rooney Mara - Lisbeth Salander from 'The Girl with the Dragon Tattoo' is the survivor of a traumatic childhood who grows into an asocial, rebellious hacker who hates people.

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Rooney Mara - Even though Mara is introverted and guarded like her character, the actor has a completely different background. She comes from a large, prominent New York family and is heavily involved in charity work.

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Brenda Song - In 'The Suite Life of Zack & Cody,' Song plays the ditzy heiress of the Tipton hotel.

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Brenda Song - But Song is actually pretty smart. She earned her high school diploma at age 16, and was named an All-American Scholar in the ninth grade.

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Dave Franco - Franco is known for portraying jerks, like Greg in 'Superbad.'

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Dave Franco - Franco is actually artistic and in touch with his feelings. He even writes poetry! Franco has said he's trying to avoid those "a****le roles."

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Selena Gomez - In 'Getaway,' Gomez plays The Kid, a gun-yielding car expert.

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Selena Gomez - The sweet-tempered actor and singer is a people person who does what she can to connect to her fan base. 

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Jennifer Lawrence - In 'Silver Linings Playbook,' the actor portrays Tiffany Maxwell, a young widow who suffers from depression.

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Jennifer Lawrence - In real life, JLaw is known for her candid honesty and bubbly personality.

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Bryan Cranston - Walter White (left) from 'Breaking Bad' is one of TV's most notoriously cold-blooded drug dealers. He doesn't let anything get in his way, including human life.

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Bryan Cranston - The actor is actually hilarious. He's also sensitive, evidenced by the fact that he cries when he talks about the scene in which Mr. White watches Jane die.

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Neil Patrick Harris - Barney Stinson from 'How I Met Your Mother' is a womanizer playboy who knows no limits.

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Neil Patrick Harris - But the real-life person behind Barney is actually gay and has been with his husband for over 15 years.

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Liev Schreiber - Ray Donovan from the TV series by the same name is a lawyer whose life revolves around protecting the rich and famous, often arranging bribes, payoffs, threats, and getting involved in other shady activities.

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Liev Schreiber - His mother still calls him "Huggy Buggy Pinchy Winchy, or Huggy for short." That's how affectionate and good-natured he is in real life.

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Danny Trejo -

Trejo specializes in villains and antiheroes, like his characters on 'Breaking Bad,' 'The X-Files,' and 'Sons of Anarchy.'

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Danny Trejo - But Trejo is actually a family guy and businessman, who owns several ventures in the food industry.

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Rami Malek - Malek perfectly depicts the socially awkward and depressed hacker Elliot Anderson in 'Mr. Robot.'

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Rami Malek - But Malek is actually a chatterbox who thrives "on affection."

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Tony Hale - Hale is best known for his portrayal of Gary Walsh on 'Veep' and Buster Bluth on 'Arrested Development,' both of whom are sheepish and lack personality.

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Tony Hale -

But Hale is actually quite anchored, using his faith in order to orient his life.

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