Barros was born in a town of Itabira, Minas Gerais, Brazil, to Sônia, a housewife, and Reinato Barros, a mechanical engineer. Later, her family moved to Rio de Janeiro, where she spent her early age. Barros is of Portuguese, Spanish and Italian ancestry and is the youngest of three sisters; Patricia, who is also a model, and Malu (Maria Luisa), Brazilian dermatologist.