Erika said she was very happy to "show the Brazilian beauty. I was very surprised. I am very happy and grateful to my mother, who voted for several mornings".
Ten million people cast votes online for the 15 finalists. Plastic surgery is allowed but not on the bottom area - with some candidates providing x-rays to prove their buxom buttocks are real.
The Miss Granny Bumbum winner was Dona Geralda, 64, a former Brazilian Big Brother contestant.