Pop superstar Rihanna insists on spending time with songwriters before they pen tracks for her to make sure they know enough about the singer.

The Umbrella hitmaker has co-written several of her own songs, but also records tunes penned especially for her - but Rihanna has a certain criteria for who she will work with.

She tells Britain's Elle magazine, "I spend a lot of time with them so they know my story by the time they write, and it's always the truth.

"At times I won't be rebellious or edgy, sometimes it'll be vulnerable and really innocent but you don't know what bad things that girl might do to get to the vulnerable state!"