Actress.

I am the Greatest Actress in the world.
I have many faces, choose your favorite?
I can say a few words and be on your stage.

Just invite me to your world,
Just give me a few instructions,
And I shall do your Bidding as you please.

I can sing you a song, From this
Robotic box, or Dance like a fish
fresh out of the water.

I shall do
All of this Because...
I am the Greatest Actress in the world.