Gwyneth Paltrow and Stella McCartney unveil a fashion collaboration

gwyneth-paltrow-stella-mccartney-fashion-line.jpg Gwyneth Paltrow and designer Stella McCartney teased some sort of partnership on Paltrow's goop website a week ago. The secret is out now: McCartney has designed a line of clothes in collaboration with her friend.

The Stella McCartney x goop line is a capsule collection -- a few interchangeable items that Paltrow and McCartney hope will be long-wearing "investment pieces" for the women who buy them (prices start at $795).

"I tend to go for more classic pieces," Paltrow tells WWD. "I wanted to make things that you'd leave to your daughter. My audience loves an investment piece and nothing will last longer. We could have done some brand-new trend collection. For the first time, we wanted to work on something that was very easy to understand."

McCartney says Paltrow's own sense of style helped inspire the collection.

"I have quite a lot of admiration for her at so many levels and that's a big part of how I design," McCartney says. "Her spirit and inner beauty as well as outer beauty are a big inspiration for me. I draw from that every day from all my friends."

The collection goes on sale on Sept. 12.
Photo/Video credit: Goop/Stella McCartney