The Waltzes came from Vienna and the Children from Paris (1966)

Name: The Waltzes came from Vienna and the Children from Paris
Genre: Comedy, Drama, Romance
Released: 1966-01-13
Duration: 115 min
Cast: Ernestina Garfias, Fernando Soler, Fernando Soto, Prudencia Grifell, Agustín Isunza

Unmarried opera singer has a baby, and her friends convince her to pass it off as the grandchild of a wealthy old lady.