Their collection is called Stella McCartney x Goop and launches on website Goop on Sept 12, reported Us magazine.
The "Iron Man" actress said she didn't design the clothes, but rather edited them.
"I think of myself as a woman who is a lover of beautiful things. I'm very specific about my taste. The role I want in a partnership is curating a collection as opposed to taking a designer point of view. I can tweak a blazer and make it the perfect blazer. It's being able to fulfill what my ideal things ought to be," she said.
"I have quite a lot of admiration for her at so many levels and that's a big part of how I design. 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," she added.