A native of Licenza and the daughter of Ercole Costantini and Geltrude Montori, Lattanzi began her acting career in 1922 when she met Vittorio De Sica, who in turn, introduced her to Tatyana Pavlova, who coached her into acting.

[1] Lattanzi was mainly active on stage during the 1920s before making her screen debut in 1930 and she was well known for her portrayals of women of noble birth.

As a prominent dubbing artist, Lattanzi performed the Italian voices of some of the major film icons of the 20th century such as Greta Garbo, Rita Hayworth, Marlene Dietrich, Joan Crawford, Greer Garson, Myrna Loy, Rosalind Russell, Martita Hunt, Agnes Moorehead, Tamara Lees and Italian actresses such as Franca Marzi.

[2] In her animated roles, Lattanzi typically dubbed the Italian voices of villains such as the Evil Queen in Snow White and the Seven Dwarfs, Lady Tremaine in Cinderella, the Queen of Hearts in Alice in Wonderland and Maleficent in Sleeping Beauty.

[3] By the time Lattanzi reached her sixties, there had been a decline in her career, yet she was still active on television.