SEE PHOTOS: Zhang Ziyi, Glenn Close, Cate Blanchett, Aishwarya Rai, Hilary Swank, Lauren Hutton, Tina Turner, Janet Jackson, Leonardo DiCaprio, Sophia Loren, Kasia Smutniak, Pierce Brosnan and Chris Pine were among the bumper crop of Armani-clad celebs that thronged Giorgio Armani’s Milan headquarters for the brand’s big 40th anniversary party on April 30, 2015. The stars paid tribute to Armani’s retrospective showcase of Armani Privé couture looks and also raised a toast to the new Armani/Silos exhibition space unveiled that evening. Click through the gallery below for the best celebrity red carpet looks. Visit www.giorgioarmani.com for more information. You can follow the brand on Facebook at www.facebook.com/ARMANI or on Twitter at @armani. All images are courtesy of Giorgio Armani.