In her early twenties, Sofia is the ambitious and intelligent daughter of an Italian immigrant. Italian born and raised in Belfast, she strides two cultures and two ages - the old and the modern. Forward thinking, original and attractive she wants to break the bonds of her heritage and move forward into the unknown with a partner who can support and understand her dreams.
Alessandra was born in Naples, Italy, but was brought up in Rome since she was five years old. She attended a Classical Lyceum and then the Sapienza University of Rome trying to graduate in Performing Arts. Previously she had attended a Psychology course in the same Institution.
Her debut as an actress was in 1997, in the miniseries Un prete tra noi, followed by: Amico mio 2 (1998), directed by Paolo Poeti, Lui e lei 2 (1999), Il veterinario, by José María Sánchez, and Il grande Torino with Remo Girone and Michele Placido, direcetd by Claudio Bonivento, in which she pictures the character of Rosa Di Girolamo, both filmed in 2005, and an episode of Don Matteo 5 (2006). She also had some roles in different films : Il manoscritto di Van Hecken (1999) and The Beast in the Heart (2003); moreover some short subjects make part of her range of performances Cose che si dicono al buio, by Marco Costa, and Due sigarette, both filmed in (2004).
Mastronardi gained more fame, above all in Italy, when she becomes a regular member of the cast of the 2006 Italian version of the TV series Los Serrano, I Cesaroni, in which she plays the part of the young shy and romantic girl Eva Cudicini. In 2006 she's the main character, together with Matteo Branciamore, in the music video Stai bene come stai, performed by the Italian musical group Le Mani.
On January 16, 2007 she made her debut in the theatre, in the comedy The Prozac Family, directed by Marco Costa. She portrays the character of Margherita, while the role of her fiancée Mamo was played by Eros Galbiati, who became popular in Italy, in 2006 thanks to the film Notte prima degli esami.
Mastronardi played Milly, a young bride and astronomy teacher in the 2012 Woody Allen film, To Rome with Love.