Rihanna's collection for River Island will be ''casual, chic and flirty''.

The 'Man Down' singer has been working hard on her fashion line debut for the British high street chain, and hopes it includes pieces that will appeal to a wide variety of girls.

She said: ''The collection is casual, it's chic, it's flirty. I wanted all types of girls to be able to wear this and feel comfortable but edgy.

''I wanted there to be character within the clothes, but without it trying too hard. It's just simple.''

The 24-year-old star also told how her designs will help the wearer to express their moods.

She added to the Daily Mirror newspaper: ''My style is inspired by my mood. This collection will definitely have a range of different moods, different attitudes because I'm assuming my fans will be the same way.

''I have been wanting to design my own fashion line for a very long time. This has been something I have wanted to do ever since I started loving fashion.''

Rihanna has also recently filmed her first ad campaign in Los Angeles with a host of models.

Style Insider blog wrote: ''Rihanna joined us at Milk Studios in LA to direct her first ad campaign and our first Rihanna for River Island range.

''Models including Jourdan Dunn, Bambi Northwood-Blyth and Ataui Deng hit the set for the shoot in looks styled by the inimitable, Mel Ottenberg. Rihanna's design partner for the collection,

''Adam Selman [Rihanna's co-designer on the collection], was also on hand to make sure the pieces he created with Ri Ri looked perfect on the girls.

''Ever the multi-tasker, Rihanna was juggling styling with Mel and directing the look and feel of the campaign shots. She even managed to squeeze in a quick chop from her hair hero, Yusef Williams, who we met on the 777 tour.''