Trio joins the Grace Kelly biopic.

Tim Roth (‘Arbitrage’) has been tapped to play Monaco’s Prince Rainier III opposite Nicole Kidman’s Grace Kelly in Olivier Dahan’s ‘Grace of Monaco.’

Variety also reports that Frank Langella (‘Frost/Nixon’) and Spanish actress Paz Vega (‘Talk to Her’) have joined the cast.

Langella will take the role of Father Tucker, the priest who set up Kelly with Prince Rainier and dispenses advice to ensure they can survive any trouble that threatens to disrupt their marriage, while Vega has been cast as renowned opera singer Maria Callas.

Penned by Arash Amel (‘The Expatriate’), the film is set between December 1961 and November 1962, the story follows the Hollywood starlet turned princess as she is called upon “to save Monaco from an escalating situation regarding its standing as a tax haven, with French leader Charles de Gaulle giving her husband, Monaco’s Prince Rainier III, six months to reform its tax laws. At the time, Callas was Greek millionaire Aristotle Onassis’ girlfriend, so while he advised Prince Rainier, she befriended Kelly and became one of her closest confidantes.”

‘Grace of Monaco’ is set to begin filming in the autumn in France.