Credit: Dave Hogan/Getty; Dave M. Benett/Getty

Fans were surprised when Michelle Williams and Amanda Seyfried, who usually wear high-fashion designers like Chanel and Prabal Gurung, stepped out in designs by H&M recently.

But now, we learn that the store, known for its fashionable yet affordable garb, is launching a collection next month and will include both Seyfried's turquoise shorts and matching blazer and Williams' chic black and white column dress.

Called "Exclusive Conscious," the designs will be made from sustainable materials, like organic cotton and hemp, and will boast a variety of eye-popping looks.

The line is scheduled to go on sale at H&M stores and on around April 12.

Exclusive Conscious follows in the footsteps of the just-released Marni x H&M, the store's most recent designer collaboration, which drew in hoards of fashionistas on its March 8 launch.