Annabella was born on 11 June 1943 in Saronno (Varese). She enter in the world of entertainment after having attended the Centro Sperimentale di Cinematografia in Rome, but without having completed its studies.
On the silver screen she usually plays important roles, but rarely manages to emerge as a true protagonist; it is the case of minor productions such as Operazione Goldsnake (1966) by Ferdinando Baldi and in A suon di lupara (1968) by Luigi Petrini. She appears in the western vein, in such titles as Un poker di pistole (1967) by Giuseppe Vari and Quella carogna di Frank Mitraglia (1968) by John Berry.
In the 1969 she married Guglielmo Biraghi, film critic of the newspaper "Il messaggero", from whom she has a son, but soon the marriage ends in separation. Also in 1969 she plays an homosexual in the film A doppia faccia, a thriller by Riccardo Freda. The notoriety that gets from that "scandalous" role, favors her in numerous films participations, in which usually she interprets the prototype of the lesbian (Roma bene - 1971 by Carlo Lizzani, Sette scialli di seta gialla - 1972 by Sergio Pastore, Perché quelle strane gocce di sangue sul corpo di Jennifer? - 1972 by Giuliano Carmineo) or the part of the femme fatale (Amore formula 2 - 1970 by Mario Amendola). At the same time she also appears on some photonovels ("Sogno", "GrandHotel").
Her film career ended in 1982, after about thirty films, with the thriller Enigma by José Ramón Larraz. On television she has worked in various series, of which the most famous was L'Eneide (1971) by Franco Rossi.
In 1998, she revealed that she was Geoffrey Robinson's lover of Tony Blair's government for twenty-five years.
 Dizionario del cinema italiano. Le attrici - di Lancia, Poppi
- L'inferno addosso .... Micki
- Amore formula 2 .... Loreley