She showed her long well toned leg through the slit while walking and posing for photogs.
She accessorized with matching Ferragamo peep toe heels and a bangle and stud earrings from her own collection with Robert Procop.
Her brunette hair, styled in soft waves with a side parting, draped her right shoulder. She wore brown eyeshadow, thick eyeliner on lids and cat eyeliner on lower lashes. Nude lip gloss rounded her exquisite looks.
Brad, 47, looked dapper in a Tom Ford shawl lapel tuxedo accented with cuff links, black dress shoes, tinted glasses and slicked back hair. He sported a goatee with just strands of grey for the perfect young and distinguished look.
Other celebrities attending the film's official premiere included cast members Jessica Chastain, Sean Penn - who plays Pitt's son, Henry Hopper and Mia Wasikowska; Gavin Rossdale and Gwen Stefani, Rob Lowe, Zoe Saldana and French actress Elsa Zylberstein.