Jason Derulo knew Jordin Sparks was The One ''pretty early on'' in their relationship.

The 'Talk Dirty' hitmaker was determined to have the 24-year-old singer romantically involved in his life long-term after he broke one of his vertebrae in 2012.

Asked when he realised she was his match, he replied: ''I knew that pretty early on. I felt that when I was in the hospital with my neck injury. I felt different ... I felt like I needed her in my world.''

The loved-up couple, who have been dating for two years, admits it can be hard having a relationship in the public eye but insists they manage it well.

He explained to E! News: ''You know, of course we have our problems just like anybody else. But our relationship is a positive one and that's good for people to see in today's entertainment industry.''

The hunk believes the secret to their successful romance is their love of food and opposite personalities, which makes their relationship ''fun.''

He said: ''We just try to do different things. We both love food. We're opposites...so we bring different things to the table and that keeps things really fun because her interests are not necessarily my interests.''