Born in São Paulo, Marx started her career as a child, taking part in the 1983 Rede Manchete children show Clube da Criança, and shortly later becoming a member of the children's musical band Trem da Alegria.

[1] In 1987, she left the group and made her solo debut with the album Patrícia ‘Paty’,[2][3] which sold over 350,000 copies and was certified platinum.

[4] Starting from 2010, Marx released several albums in couple with her then husband Bruno E.[2] In 2023, she took part in The Masked Singer Brasil as a member of the trio Os Suculentos ('The Succulents') with Rosanah Fienngo and Sylvinho Blau-Blau [pt].

[5] Marx was married to the producer Bruno E. for 18 years and they had a son, Artur.

[6] In March 2020, Marx revealed to be a lesbian,[7][6] and the same year she married the architect Renata Pedreira.