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- Billie Eilish made her debut at the Met Gala on Monday night.
- The event's co-chair wore a light-peach tulle Oscar de la Renta gown with a 15-foot train.
- Eilish brought photos of Marilyn Monroe and Grace Kelly to the designers of the gown.
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You only get one debut at the Met Gala, and Billie Eilish made sure her first time was unforgettable.
The songstress stunned at fashion's biggest night in a light-peach Oscar de la Renta gown that oozed Old Hollywood glamour for this year's "In America: A Lexicon Of Fashion" theme.
Eilish's tulle gown featured a corset and flowing 15-foot train, which five people carried behind her as she walked up the Metropolitan Museum of Art's iconic steps.
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And there was plenty of sparkle thanks to Eilish's 30 pieces of Cartier, the most worn by anyone in one sitting, according to Vogue.
She paired the ensemble with a bold red lip and short blonde bob, with many comparing the look to Marilyn Monroe.
Eilish, who is a co-chair for this year's Met Gala, actually brought images of Monroe - along with Grace Kelly - to Oscar de la Renta during the design process, according to The New York Times.
"She was very interested in surprising everybody with a look she hasn't done before," creative director Fernando Garcia told The New York Times. "It felt like a risk for her - it felt like something that made her nervous in a good way."
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When asked about her gown on the red carpet, Eilish told E!: "Doesn't it speak for itself?"
"This is the first thing I've ever done in this realm at all," she added. "I'm shivering and shaking."
"I'm so excited I have butterflies," she added. "I couldn't be happier."
Eilish also used her Met Gala debut to make a major change at Oscar de la Renta.
According to The New York Times, the 19-year-old told the major fashion brand that she would only wear an outfit from the designer if it terminated all fur sales.