Gwyneth Paltrow is to collaborate with Stella Mccartney.

The Hollywood actress looks set to team up with her fashion designer friend for a new project to do with the blonde beauty's Goop company - for which she writes a weekly publication about travel, fashion, food and healthy living - following a mysterious post on her website and Stella's Facebook profile.

The message reads: ''Stella McCartney. goop. Launching September '13 (sic)''

But there are no other details about the collaboration, with some suggesting it could be anything from sunglasses, shoes or even bags.

The current line-up of Goop products includes a sunglasses collection, while Goop once teamed up with Butter London to create a special collection of nail polishes.

On Friday (23.08.13), the pair attended an English garden party in Amagansett, New York, which Stella hosted for Goop.

Gwyneth attended one of Stella's parties at her Hollywood boutique last year, but the 'Avengers' actress and her husband Chris Martin reportedly insisted on being driven to a dinner at a restaurant just four properties away following the event.