Man have those mini mogul twins been busy. Building on their growing fashion empire, Ashley and Mary-Kate Olsen have announced they are adding a small denim collection to their Elizabeth & James label. The Seventies-inspired jeans, aptly named Stevie, will launch next month and will set you back between $100-$200 a pop.

But that's not all that they've been up to...

The twins have also just launched a new label Olsenboye, their brand new project for JCPenney. And to celebrate the launch, JCPenney are inviting all wannabe designers aged 13 to 21 to submit an original apparel item to be in the running to actually design for Olsenboye (open to residents of the USA only sorry!).

One lucky winner will score a grand prize trip to New York City, a chance to meet Mary-Kate and Ashley Olsen, a $1,000 JCPenney style shopping spree and a golden opportunity to have your design included in a future Olsenboy collection. Nine runners up each receive $500 JCPenney gift cards.

Details on how you enter can be found here: www.olsenboyedesigncontest.com.

[via Nitrolicious]