Mary-Kate and Ashley Olsen's friends helped them design their latest fashion range.

The 23-year-old twins - who already have two clothing lines, The Row and Elizabeth + James - recently launched their new junior range, Olsenboye, and wanted input from their peers.

Mary-Kate said: "We've been working with our friends who are our age and in art school."

Ashley added: "They've helped out with the art on the web sites and doing the commercials and the videos."

The line - which is aimed mainly at teenagers, with most price tags under $50 - is sold exclusively at US store JCPenney and the girls are thrilled to be working with them.

Mary-Kate told people.com: "All the people at JCPenney have totally embraced all of our friends that have now participated in these projects and it's a lot of young talent and I think it's really exciting."

Ashley also revealed she is looking forward to next season's looks as she's not a huge admirer of the over-exaggerated shoulder look.

She said: "I'm a fan of strong shoulders, but I think the extreme shoulder, to me - it takes a very special person to pull it off. And I'm kind of ready to move on from that."