Valentino Dresses Keira Knightley for La Traviata Premiere

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Valentino spearheaded the costume design for the highly acclaimed opera, “La Traviata.”

The gala was a star-studded event, with other attendees including Kim Kardashian, Kanye West, Monica Bellucci, and Elizabeth Hurley. The opera was a critical and commercial success, and fashion critics praised the costumes by Valentino.

Keira Knightley graced the inaugural evening of "La Traviata," the opera directed by Sofia CoppolaKeira Knightley graced the inaugural evening of “La Traviata,” the opera directed by Sofia Coppola (Credit: SHOTPRESS / WENN)

Many famous celebrities and fashion icons, including Keira Knightley, jetted to Rome to see the opera.

Keira Knightley's attire of choice was a rich crimson velvet gown from Valentino's Fall 2015 Haute Couture collectionKeira Knightley’s attire of choice was a rich crimson velvet gown from Valentino’s Fall 2015 Haute Couture collection (Credit: SHOTPRESS / WENN)

The actress seemed to get the Valentino memo since she wore a gorgeous dress from the fashion powerhouse when she attended the performance.

Keira Knightley's husband, Righton, joined her in a black tuxedo at the event, where Valentino's creative directors, Chiuri and Piccioli, were present and photographed with Knightley and RightonKeira Knightley’s husband, Righton, joined her in a black tuxedo at the event, where Valentino’s creative directors, Chiuri and Piccioli, were present and photographed with Knightley and Righton (Credit: SHOTPRESS / WENN)

The 31-year-old showed off her slender body in a Grecian-style Valentino Fall 2015 halter neck velvet evening gown.

Her floor-length velvet frock featured a small train and a bare back — the simplicity and elegance perfect for an opera night. Keira hid a pair of Valentino “Strass” sandals underneath the velvet dress.

Keira Knightley, James Righton, Maria Grazia Chiuri, and Pier Paolo Piccioli at the "La Traviata" opening gala held at Teatro Dell’Opera Di RomaKeira Knightley, James Righton, Maria Grazia Chiuri, and Pier Paolo Piccioli at the “La Traviata” opening gala held at Teatro Dell’Opera Di Roma in Italy on May 22, 2016 (Credit: SHOTPRESS / WENN)

This couture creation isn’t available online, but we did find two similar alternatives.

Dsquared2 Pleated Evening Gown1. Dsquared2 Pleated Evening Gown, $2,006.55

Joanna August DC Halter Wrap Dress2. Joanna August DC Halter Wrap Dress, $285.00

What do you think of Keira Knightley’s red Valentino dress?