50 Cent only signed up for 'Dead Man Running' because of Brenda Blethyn.
The 'Crimewave' rapper said he was assured of the quality of the film when he found out the 63-year-old 'Atonement' actress would be cast alongside him in the British gangster film.
He said: "I only go for films which have a certain level of artistic integrity and I knew I would be safe in Brenda's company."
Brenda, meanwhile, has said she has enjoyed the boost to her "street cred".
She added: "My street cred has rocketed since I have been in a film with 50 cent."
The rapper - real name Curtis Jackson - also said his greatest character to date has been his aggressive rap persona, and added that people are always surprised by how polite he is in the flesh.
He added: "People say, 'wow he was so nice!' when I come around and there's normalcy. They go 'yes, he was nice!' and I've made no effort to be nice, it's because they expect me to shoot them. It's just, because that's been in my life, and I've been exposed to some things they know are true, so they have a different expectation."