▲Many people would never guess that the president of a country could be an introvert. However, studies have shown that introverts can make excellent leaders. Though you might not have guessed it, former head of the United States, Obama, is also an introvert.

▲Surprisingly, the incredibly successful actor didn't always see himself as a movie star—"I didn't want to be an actor, because I thought an actor had to be an extrovert - somebody who loved to tell jokes and talk and be a raconteur. And I was something of an introvert."

▲The pop singer admitted in an interview that she has always been intense and introverted. As a result, she’s felt like an outsider her entire life.

▲The actress is famously quoted as saying, “There is a tremendous difference between alone and lonely. You could be lonely in a group of people. I like being alone. I like eating by myself. I go home at night and just watch a movie or hang out with my dog. I have to exert myself and really say, oh God, I’ve got to see my friends because I’m too content by myself.”

▲Although the actor has starred in numerous movies and received the Life Achievement Award of the American Film Institute, he is terrified of public speaking.

▲One of the most controversial pop singers—known for her outrageous outfits and lavish performances—says that in reality, she's quite shy and introverted. "I always feel shy in the Hollywood scene. I feel a bit like I did in high school, like I don’t really fit in.”

▲One characteristic of introverted people is a preference for reading or participating in solitary activities. The same is true for this actress—“I think enough cannot be said for what you can discover through literature. So I think that was probably my most valued characteristic as a teenager.”

▲The actress admits, "It’s a good thing, to imagine yourself doing something you think you can’t. I do that every day, because basically, if I had my way, I’d just stay home and think about what I’m having for supper.”

▲The famous 'Friends' actress stated that personality differences was one of the reasons she split with her husband. She said, "He's very outgoing. I'm much more of an introvert."

▲The world-renowned actor is quoted as saying, “E-mail is far more convenient than the telephone. As far as I’m concerned, I would throw my phone away if I could get away with it.”

▲The actress is a self-proclaimed introvert, making her Twitter followers laugh with her witty tweets about being an introvert and a celebrity at the same time—"My life would be so much easier if it wasn't for that thing…God, what is that thing called…other people."

▲While many introverts describe themselves as being shy, these two qualities are not mutually exclusive. Writer Susan Cain wrote about Gates, "Bill Gates is quiet and bookish, but apparently unfazed by others’ opinions of him: he’s an introvert, but not shy."

▲One trait often shared among introverts is being highly sensitive. The actress says of herself, “I am so sensitive it drives me crazy.” Additionally, many people have commented that the actress appears awkward and stiff in interviews due to her shyness.

▲One of the greatest basketball players of all time is also an introvert.

▲The actress spoke to her introverted nature, saying, "I always felt a little like an outsider looking in."

▲The actor was a shy introvert as a child. He spoke about it in an interview: "My first language was shy. It's only by having been thrust into the limelight that I have learned to cope with my shyness."

▲The founder of PayPal, Space X, and Tesla said that despite his success and fame, he always considered himself an "introverted engineer."

▲The talk show host may seem like an outgoing, people-loving extrovert, but he's actually an introvert.

▲The 'Titanic' star is a self-admitted introvert.

▲The Golden Globe award-winning actress states, “I was the girl who cut school to go to the park, and the other kids would be smoking and drinking and I’d be reading Shakespeare.”

▲Zuckerberg says that his introversion enabled him to create one of the largest social media platforms in the world, because spending so much time alone gave him the time and space to be innovative.

▲Many people have speculated that the former First Lady's introverted personality made her unpopular. Michael Melcher from the Huffington Post wrote, “people assume that everything she does has some core meaning that has implications for her potential presidency or her character. But sometimes Hillary is just being an introvert, and that’s that.”

▲The New York stage actress admitted to disliking public events and being in the public eye—"I don't think the tabloids find me very interesting."

▲The actor made a YouTube video with actress Carey Mulligan exploring the differences in their personality types, even though both consider themselves introverts.

▲The co-founder of Google became the CEO in 2011. He's been described as "personally reserved, unabashedly geeky, and...introverted."

▲This public figure, former Vice President, presidential candidate, and author of 'An Inconvenient Truth' was another successful introvert.

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The actress always embraced her introversion—"What a lovely surprise, discover how unlonely being alone can be."

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One of the greatest directors of all time spoke of his personality type, “I never felt comfortable with myself, because I was never part of the majority. I always felt awkward and shy and on the outside of the momentum of my friends’ lives.”

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Being a famous celebrity and an introvert are not mutually exclusive. Many highly successful actors, politicians, singers, and businessmen are introverts—meaning that being around other people drains their energy, while spending time alone recharges their batteries. Introverts are often seen in a negative light, but these highly sensitive, quiet, and introspective people are actually known to make incredible leaders and find as much success in life as their extrovert counterparts. Learn a bit more about some of the most famous celebrity introverts in the following gallery.