Who Am I?

Smarty-pants challenge! Read the clues, guess the person...
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Clue #1: I escaped a life of poverty and addiction in New York City and headed West to work on my one-woman show.

Clue #2: There was a time where you’d find me in the “center square.”

Clue #3: I’ve always loved comedy, but my first big break came when Steven Spielberg cast me as the lead in a film based on an Alice Walker novel.

Clue #4: I’m no psychic so how could I possibly predict I’d win an Oscar for playing one?

Clue #5: Not to toot my own horn, but I’m one of the few entertainers who have won an Emmy, a Grammy, an Oscar and a Tony.

Clue #6: I’m not afraid to say what I think and sometimes my point of View causes controversy, but I’m cool with that.

Clue #7:  I admire comedian Moms Mabley so much, I produced an HBO documentary about her.

Who am I?