Firmino's Liverpool teammates Coutinho, Lucas and Souza also attended the wedding.
Firmino and Pereira have been dating for four years and have two kids together.
The couple on Tuesday, June 20 finally tied the knot in a very expensive wedding ceremony in the Brazilian city of Maceio.
Liverpool Brazilian players Philippe Coutinho, Allan Souza and Lucas Leiva were at the ceremony to support their teammate.
Popular Brazilian pop star Gabriel Diniz performed a number of his hits at the ceremony and was joined on stage by Firmino, Coutinho and Lucas.
Firmino and Pereira have two daughters.
His wedding comes after an impressive season for Liverpool scoring 12 goals in all competitions as they qualified for the Champions League.