Jennifer Lawrence says she and Bradley Cooper are ''work husband and wife'', but with ''no sex''.

The Hollywood duo have starred alongside each other in a number of high-profile movies, including 'Silver Linings Playbook' and 'American Hustle', and speaking ahead of the release of their new movie 'Serena', Jennifer said she convinced her 40-year-old co-star to appear in the film.

The Oscar-winning actress said: ''I forced him to come onto [Serena]. I mean, any male role is going to make me think of Bradley because in my opinion, he's the best, and I love working with him.''

However, when she was asked to reveal the secret to their successful on-screen relationship, Jennifer joked: ''No sex!''

Bradley - who will once again star alongside the 24-year-old beauty in David O. Russell's 'Joy' - said: ''I respect her so much as a professional, as an actor, I think she's the best there is.''

The release of 'Serena' comes shortly after it was widely reported that Bradley had split from his girlfriend Suki Waterhouse.

The couple - who have been dating for approximately two years - are said to have parted ways before the Academy Awards in January, which they attended together.