Blake Lively's red carpet entrance to the Met Gala was surely the show-stopper of the night.
She wowed as she arrived in her burnt orange dress which was inspired by the buildings and architecture of New York city.
But the over-sized bow at her waist hid a secret contrasting train which drew shrieks of delight when it was unfurled as she walked gracefully up the stairs.
Watch now: Ryan Reynolds reacts as Blake Lively unveils second Met Gala look.
No-one was more blown away than Lively's husband Ryan Reynolds whose mouth dropped open when his wife's new look was unwrapped.
The actor looked on proudly as assistants untied the bow to let down a glittering teal train with rose gold embellishments which contrasted perfectly with the strapless dress.
Her pink gloves also turned blue and gold during the stunning transformation in the middle of the stairway.
The former Gossip Girl star paired the incredible frock with a tiara and emerald and diamond earrings.
The couple were two of the event's co-hosts, with Reynolds keeping his look simple in a velvet tux to let his wife's two-in-one frock be the star of the red carpet arrivals.
Lively later explained that her Atelier Versace dress was inspired by "New York City architecture and classic buildings," as she noted different elements of the look that were pulled from Grand Central Station, the Empire State Building and the Statue of Liberty.
She also pointed to the crown on her head which has seven tiers to explain its symbolism.
"The Statue of Liberty has seven rays, representing the sun’s rays," Lively explained. "And then also the seven seas and continents, which represents welcomeness, inclusivity, freedom."
For the after party the 34-year-old actress switched out of her show-stopping gown to change into a stunning red jewelled micro-mini dress with fringing.