Paul Sculfor has landed his debut acting role. The builder-turned-model - who has been dating 36-year-old actress Cameron Diaz since last May last - is going to star in upcoming horror movie "Vivid," and has been receiving acting lessons from his "What Happens in Vegas" star girlfriend.

A source said: "Cameron has shown him tricks of the trade."

Paul will star alongside former The Darkness singer Justin Hawkins and 38-year-old "Buffy the Vampire Slayer" actress Charisma Carpenter.

Shooting on the film - which is about a New York novelist who moves to the English countryside and starts having visions of a horrific massacre which took place years before - starts later this week, when Paul has been desperate to get a movie break and has attended numerous castings in the U.K. and the U.S. over recent months.

Meanwhile, Paul and Cameron are believed to be considering marriage.

A source said: "Cameron and Paul are having a wonderful time and don't want to spoil it by pushing things, but they have used the m-word occasionally."

"They're playing house in a serious way - both openly admit marriage scares them but they are very much in love and the subject has come up."