10 Things You Don't Know

The most unbelievable, surprising, and OMG things about Brad Pitt, from his steamiest movie scenes to his shocking pre-fame jobs.

The most unbelievable, surprising, and OMG things about J. Lo, from how she prepared for `Hustlers' to how she changed the internet forever.

The most unbelievable, surprising, and OMG things about Tiffany Haddish, from the celebrity that changed her life to a crazy job she had pre-fame.

The most unbelievable, surprising, and OMG things about Keanu Reeves, from the story behind his famous name to where all of his `Matrix' money went.

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

How Will Smith met Jada and the true story being his Fresh Prince paypackets.

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

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

Surprising things about Oprah Winfrey, from how she got her Oscar nomination to how she and Gayle really became best 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 Reese Witherspoon, from all the secrets behind "Legally Blonde" to what really happened on the set of "Friends."

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

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