Celebrities in their youth - Some celebrities launch their careers at a young age, while others may not make it into the public eye until later in life, making it difficult to recognize them in their younger years. Check out how some major celebrities looked as they were starting out.

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Mick Jagger - A photograph of the young Rolling Stone at 20 years old.

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Celine Dion - The Canadian singer in Monte Carlo during the 1995 World Music Awards.

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Helena Bonham Carter - The British actress at 18, looking adorable in suspenders and a collared blouse.

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Leonardo DiCaprio - This actor's baby face makes him look far younger than 17. The photo was taken on the set of 'Growing Pains,' in which he starred as Luke.

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Meryl Streep - The young American actress at the beginning of her career in 1980.

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Matthew McConaughey - Another actor just starting out. He's seen here as the protagonist in 'A Time to Kill,' in 1996.

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Richard Gere - The American actor at a party in London in 1973, when he was 24. At the time, Gere was starring in a production of 'Grease.'

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Jennifer Aniston - The American actress at 23, showing off her red locks during her stint in the television show, 'The Edge.'

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Michael Jackson - The American singer aged 14 in London, during a tour with The Jackson 5.

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Jack Nicholson - A photograph of the American actor in 1975.

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Helen Mirren - The British actress during a publicity campaign for the movie 'Age of Consent,' in 1969.

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Jon Bon Jovi - The musician arriving at the 13th Annual Moving Image Ball in Los Angeles, 1998.

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Woody Allen - The American filmmaker with Diane Keaton in London, in 1970.

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Brad Pitt - The heartthrob Hollywood actor at the premier of 'True Romance,' in 1993.

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Steve Martin - The actor and comedian during a broadcast in 1978.

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Robert Downey, Jr. - Before 'Iron Man,' at the premiere of 'Friends & Lovers,' in 1998.

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Mel Gibson - At 26 years old, posing on Coogee Beach, Australia.

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Cameron Diaz - The24-year-old actress is posing at the premiere of 'Feeling Minnesota' in California.

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Elton John - The legendary British pop star relaxing on his couch in 1974.

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Brooke Shields - The 15-year-old actress on the set of 'The Blue Lagoon.'

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Jennifer Love Hewitt - The actress was in 'Party of Five' when she was 19.

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Arnold Schwarzenegger - The Austrian actor and body builder showing off for the camera in 1980.

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Jodie Foster - The teenage actress performing tricks on her skateboard.

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Julia Roberts - The actress in her first role, in 'Michael Collins,' in 1996.

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Diane Keaton - The American actress wearing a polka-dot tie at a restaurant in 1980.

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Sandra Bullock - The actress in 1996, when she starred in the movie 'A Time To Kill.'

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Robert De Niro - The American actor photographed at a gala in 1979. This year he starred in 'The Swap.'

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Jennifer Lopez - J.Lo when she starred in the comedy 'Jack,' in 1996.

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Ashton Kutcher - The actor at 21, attending a party for the popular television show, 'That 70's Show,' in Los Angeles.

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