The Princess Is A Villainess

Everyone knew Cinderella and her story.
She lived a vicious life when her divorced parents needed to work in the Royal Palace and left her alone. Her stepmother and her two stepsisters did nothing but mistreat her, not until that party happened.
A fairy grandmother, a dance, and a fallen shoe. Cinderella and the prince were married and lived happily ever after.
Or... did they?
What would happen if the princess everyone adored throughout their life was the antagonist everyone would hate if they only knew?
What if the beloved princess... is the true villainess?