THE identity of the mystery girl that English actor Jude Law is dating has now been revealed.

Law, 40, was spotted with Mauritian model Alicia Rountree at the airport in Marseille, France.

Rountree, 25, was apparently accompanying him in France for the premiere of his movie, psychological thriller Side Effects.

According to a source, the relationship got "pretty serious really fast".

Law had dated British-American actress Sienna Miller from 2003, after they met on the set of comedy-drama Alfie.

They called off their engagement in July 2005 after Law confessed to having an affair, but continued dating until February 2011.

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