Naples, July 8 - Crowds of adoring fans slowed production of a new Sophia Loren film being shot in her hometown of Naples Monday. The film, a short based on Jean Cocteau's 1930 play La Voix Humaine (The Human Voice), was in production in the San Ferdinando neighborhood when locals crowded around, shouting 'Sophia' and clapping as they caught a glimpse of the Italian sex symbol and screen icon. "You're the heart of Naples," cheered a group of onlookers in Neapolitan who could not be kept indoors by the pouring rain. Loren, who is performing in the Naples dialect for the film, thanked her fans at one point before returning to the delayed shoot, which is scheduled to last three weeks. The 78-year-old last appeared on the big screen in Nine, a 2009 musical romance starring Daniel Day-Lewis, Judi Dench, Nicole Kidman and Penelope Cruz. In 2010 she played her own mother in an Italian TV mini-series, La Mia Casa E' Piena di Specchi (My House Is Full of Mirrors). The Human Voice, traditionally a one-person performance, is directed by her 40-year-old son, Edoardo Ponti, and set in Rome, the nearby town of Ostia and Naples.