Blake Lively and Ryan Reynolds have taken date night to the Met Gala red carpet. On Monday, the couple made an appearance at the Metropolitan Museum of Art in New York City, looking glamorous and brilliantly chic — and Lively even pulled off a costume change on the main steps.

This year’s Met Gala accompanies the second part of the Costume Institute’s exhibition, “In America: An Anthology of Fashion,” with the controversial theme “Gilded Glamour and White Tie.” The concept is a homage to the United States’ Gilded Age, an era of immense economic growth and major industrialization, as well as massive income inequality, political upheaval, and post-Civil War racism.

READ MORE: How to Watch and Stream the 2022 Met Gala Red Carpet

Lively and Reynolds kept true to the theme, with Reynolds wearing a classic tuxedo — including a striking gold pocket watch — and Lively rocking an outfit that began as a shimmering, copper art deco gown, created by Versace.

Reynolds and Lively hit the red carpet in style ahead of serving as official co-chairs for the evening.
Reynolds and Lively hit the red carpet in style ahead of serving as official co-chairs for the evening. — Photo: Theo Wargo/WireImage/Getty

Then, after some quick adjustments, the gown transformed into a blend of metallic copper and pale green copper patina.

Blake Lively transforms look to reveal a teal skirt and gloves.
Blake Lively transforms look to reveal a teal skirt and gloves. — Photo: Mike Coppola/Getty Images

Speaking with ET‘s Rachel Smith on the red carpet, Lively — who also rocked Lorraine Schwartz jewelry and Christian Louboutins — explained her inspiration for the general design of the ensemble.

READ MORE: Met Gala Secrets: Why Kim Kardashian's 2019 Look Got Anna Wintour's Attention and More (Exclusive)

“I looked at New York City architecture for this event, and I loved the copper patinas,” she shared. “I asked Versace if we could do it and they said, ‘Oh god, OK, let’s try!’ And we did.”

The transformation was quick, and elicited a surprised cheer from the crowd.

The couple are co-chairs for the grand event alongside Oscar winner Regina King and actor, composer, and director Lin-Manuel Miranda.

Designer Tom Ford, Instagram head Adam Mosseri, and Anna Wintour, the Artistic Director of Condé Nast and the Global Editorial Director of Vogue, also co-chaired the 2022 event after last September’s Part One of the In America exhibit.

READ MORE: Most Fabulous and Outrageous Met Gala Looks of All Time

Lively’s last Met Gala appearance was in 2018, where the star went solo as her husband was in Madrid, Spain, for a “Deadpool 2” photocall. The “Simple Favor” actress had no trouble at all shutting down the carpet herself. Lively wore a stunningly regal Atelier Versace gown with sheer paneling down either side, paired with over $2 million worth of Lorraine Schwartz jewelry.

Blake Lively
Blake Lively — Photo: Dia Dipasupil/WireImage
Blake Lively
Blake Lively — Photo: Dia Dipasupil/WireImage

And similar to some of the other fabulous Met Gala looks, Lively honoured the year’s theme, “Heavenly Bodies: Fashion and the Catholic Imagination,” with a crown headpiece. And, a true testament to the attention to detail of the ensemble, her hair was actually colored by hairstylist Rona O’Connor of Lukaro Salon to match her dress.

Blake Lively
Blake Lively — Photo: James Devaney/GC Images

Entertainment Tonight is on the red carpet so keep checking back with ETonline for more coverage from fashion’s biggest night.

More From ET:

Janelle Monáe’s 2022 Met Gala Look: All the Behind-the-Scenes Details! (Exclusive)

Victoria Beckham Celebrates David Beckham’s 47th Birthday With Must-See Cake

Jimmy Kimmel Contracts COVID-19, Reveals ‘Live!’ Guest Host