Rossi Stuart was born on 31 October 1969, in
Rome. His father,
Giacomo, was an actor of
Italian and
Scottish descent (his mother was Scottish). Kim's mother, Klara Müller, was a former top model of
German and
Dutch descent. He began acting at the age of five. He studied theatre and in 1986 began acting regularly, especially on television productions such as the
Fantaghirò series and for the cinema with a small role in
The Name of the Rose. He reached popularity with
Karate Warrior and in the film
Poliziotti. After this commercial film, he began to act only in quality films, like
Senza pelle, where his role, a man with psychological problems, was appreciated by critics. He then acted with director
Antonioni in
Al di là delle nuvole and played Julien Sorel in the French television film
The Red and the Black (
Le Rouge et le Noir) in 1997, based upon the
novel of the same name by
Stendhal.{{cite web Rossi Stuart came back to act in the theatre with
Re Lear and with the most important Italian actors, like
Turi Ferro in the work
Il visitatore. In 2002, he appeared in the film
Pinocchio as
Lucignolo. In 2004, he played in
Le Chiavi di Casa, as a young father that attempts to forge a relationship with his teenage,
handicapped son when he met him for the first time. Later, he played Mimmo in the television film
Il tunnel della libertà (2004) and he had one of the leading roles (Freddo) in Michele Placido's 2005 film
Romanzo Criminale, based on Giancarlo De Cataldo's 2002
novel of the same name. Rossi Stuart wrote the screenplay, directed and acted in the 2006 film
Anche libero va bene. It was followed by
Piano, solo (2007), a film based on the life of Italian jazz musician
Luca Flores, with Rossi Stuart playing Flores. Another film,
Questione Di Cuore was released in 2009. Rossi Stuart's following film was
Angel of Evil, based on the life of 1970s Italian gangster
Renato Vallanzasca. It was released in Italy in January 2011 and opened in Germany in February of the same year. In 2020, he played the main role in
Cosa sarà by
Francesco Bruni. This role brought Rossi Stuart
Nastro d'argento and
Globo d'oro for Best Actor.{{cite web In 2023, he starred in
Everybody Loves Diamonds series, described as an Italian
Ocean's Eleven.{{cite web ==Personal life==