SAO PAULO, March 30 (Reuters) - Brazilian cosmetics maker Natura said on Monday that U.S. private equity firm Advent has signed a binding agreement to buy a stake in the company, while also announcing a board reshuffle that includes the departure of its founders.

* Advent International will buy between 8% and 10% ofNatura for an average price target of 9.75 reais ($1.86) pershare, Natura said in a securities filing. * The deal will be carried out in the secondary marketover a six-month period. * Advent will be entitled to appoint two members toNatura's board of directors.

BOARD SHAKE-UP

* Natura also announced changes to its board of directors,with founders Luiz Seabra, Guilherme Leal and Pedro Passosstepping down. * Chairman and former Chief Executive Fabio Barbosa willalso leave his seat. * Natura has proposed to shareholders that the four form anew advisory board, with no decision-making powers. * Under the proposal, Alessandro Carlucci would becomechairman.

($1 = 5.2520 reais)

(Reporting by Andre Romani; Editing by Gabriel Araujo)