Cate Blanchett, Laura Dern and Sinéad Burke join Jane Fonda and other artists and activists to spread the message.
Australian fashion brands join a growing contingent of celebrities who have pledged support for first responders and victims of the Australian bushfires.
Alongside the likes of Olivia Munn, Laverne Cox and Joan Smalls, the designer also celebrated the release of his self-titled book, out Nov. 12.
The actress is expected to attend the Max Mara show in Milan today.
The designer also agreed to comment on the Dolce & Gabbana debacle in China.
Guests arrived at the show in Paris just as the sun was setting over the Louvre pyramid.
The Australian actress was enjoying a weekend break in Milan with her son Roman.