Legendary US film-maker Woody Allen is filming yet another untitled movie with the hope of keeping it's story secret for a while.

Residents of Oviedo in northern Spain got the Hollywood treatment when the star rocked up with a group of other celebrities in tow.

The director has described the project, which stars Scarlett Johansson and Penelope Cruz as a "love letter to Barcelona''.

Dozens of onlookers, photographers and journalists watched as Allen and his crew filmed starlet Johansson and Javier Bardem at the city's elegant Hotel de La Reconquista.

Although the film's storyline has been kept under wraps, it is believed to be a love triangle, with Cruz and Johansson fighting over the same man.

Spaniard Penelope has yet to be seen in the city but she is expected to join the group at the end of August.

Seventy-one-year-old Allen first visited Oviedo back in 2002, when he was awarded Spain's Prince of Asturias arts prize, and said he was attracted to the city's romanesque and medieval architecture.

The city has since erected a bronze statue of the director.

The film has been described by the country's media as the biggest public investment in the history of Spanish cinema.

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