German sporting goods giant Adidas is extending Stella McCartney's contract until 2010. The Adidas by Stella McCartney collection, which was to end next year, has proved to be a great success for both parties. The fashionable sports line is Adidas' top performing range with products like off-the-shoulder sweatshirts, cut-out bathing suits and tennis dresses with ruffles. With the introduction of the line, the retailer has managed to expand his market.

Although Adidas declined to reveal the sales figures for the line, industry experts have estimated first year revenues at more than $15 million. "The world wide success of this collection continues to exceed our expectations," creative designer for Adidas, Hermann Deininger, said in a press release. "Adidas by Stella McCartney has obviously filled a gap."

The collection is sold in approximately 400 stores world wide. Prices range from $25 to $300. Meanwhile, the division has signed a contract with tennis talent Maria Kirilenko, who will wear Adidas by Stella McCartney during all her tournaments.