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Comic Kevin Hart's first time doing standup and the different career he almost had.

10 Things You Don't Know

Kevin Hart

Actress Jennifer Lawrence's famous Oscar moment and her love of reality TV.

Surprising things about Reese Witherspoon, from all the secrets behind "Legally Blonde" to what really happened on the set of "Friends."

Surprising things about Matthew McConaughey, from the night he met his wife to how he changed his life to win an Oscar.

Surprising things about Oprah Winfrey, from how she got her Oscar nomination to how she and Gayle became best friends.

Ten things about Robert Downey Jr., from how he became Iron Man to his famous celebrity roommates.

Ten things about Rihanna, from getting naked to her most iconic Met Gala looks.

How Will Smith met Jada, and the true story being his "Fresh Prince" paychecks.

The most unbelievable and surprising things about Lady Gaga -- from her famous name to why scientists are studying her.

Counting down the 10 most unique and unbelievable facts people may not know about a new celebrity each week.