Nicole Kidman as Grace Kelly

Milo Ventimiglia as Rupert Allan

Paz Vega as Maria Callas

Tim Roth as Prince Rainier III

Parker Posey as Madge Tivey-Faucon

Frank Langella as Father Francis Tucker

Derek Jacobi as Count Fernando D'Aillieres

Geraldine Somerville as Princess Antoinette

Roger Ashton-Griffiths as Alfred Hitchcock

Nicholas Farrell as Jean-Charles Rey

Robert Lindsay as Aristotle Onassis

Olivier Rabourdin as Emile Pelletier

Pascaline Crêvecoeur as Grace Kelly's dresser

Jeanne Balibar as Countess Baciocchi

André Penvern as Charles de Gaulle

Nicolas Nasica as Driver Triumph

Flora Nicholson as Phyllis Blum

Yves Jacques as M. Delavenne

Jérémie Covillault as Mr. Sécurité Palais

Philip Delancy as Robert McNamara

Jean Dell as Denard

Guillaume Briat as Homme émission TV

Nicholas Hawtrey as Ministre

Alban Casterman as Producteur Hollywood

Laurent Jumeaucourt as Lieutenant français CRS

Ariane Séguillon as Femme du marché

Alexandre Pottier as Rainier Minister

Satya Dusaugey as Detective Madge

Lorenzo Harani as Hollywood Crew (uncredited)