Jennifer Lopez, Gisele Bündchen, Emily Ratajkowski and Salma Hayek dressed to impress at fashion's biggest night out – the Met Gala.

While gorgeous ensembles were featured on the red carpet, the highlights of the evening also came in not one, but two baby announcements. 

Serena Williams announced she and husband Alexis Ohanian are expecting their second child, and Karlie Kloss revealed she is expecting once again with her husband, Joshua Kushner.

The legacy of late fashion designer Karl Lagerfeld was the inspiration for the night, which notoriously falls on the first Monday in May.

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Nicole Kidman wore vintage Chanel while Jennifer Lopez rocked Ralph Lauren and Serena Williams announced pregnancy at Met Gala

Nicole Kidman, Jennifer Lopez and Serena Williams had a blast at the Met Gala in New York. (Getty Images)

Lagerfeld was known for leading multiple fashion houses, including Balmain, Chanel, Fendi and Chloé.

Rihanna showed up fashionably late to the Metropolitan Museum of Art wearing a crisp white Valentino gown with a matching floral hood.

Her baby bump was expertly concealed underneath the massive cape as she walked hand in hand with boyfriend A$AP Rocky, who rocked a signature Lagerfeld look complete with multiple belts and a white button down shirt under a black blazer.

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Bündchen returned to the Met Gala in grand fashion, marking her first time at the star-studded event after finalizing her divorce from Tom Brady.

The 42-year-old supermodel sported a vintage Chanel gown with feathered wings for the opening of The Costume Institute's new spring exhibition. 

"I loved the memories with him and the times together," she told Met Gala red carpet host La La Anthony of working with Lagerfeld throughout her career. "He was a gentleman and a wonderful man." 

Jennifer Lopez showed some skin in a cut-out dress at Met Gala in New York

Jennifer Lopez wore a black Ralph Lauren gown with a pink satin skirt. (Getty Images)

Gisele Bundchen wore vintage Chanel white gown for Met Gala in New York

Gisele Bündchen spread her wings on the Met Gala red carpet in New York. (Getty Images)

Gisele Bundchen smiles in sheer white Chanel gown at Met Gala in New York

Gisele Bündchen was giddy on the red carpet at the Met Gala just seven months after divorcing Tom Brady. (Getty Images)

Pregnant Rihanna wears stunning white Valentino dress with floral hood to Met Gala with boyfriend A$AP Rocky

Rihanna showed up fashionably late to the affair, but made quite the entrance wearing a white Valentino ensemble. (Getty Images)

Lopez walked the carpet showing some skin in a Ralph Lauren gown with a black satin bra top to match a tight pink skirt which billowed down into a mermaid tail.

She wore a black fascinator hat, and after saying hello to herself, told Anthony at the top of the stairs: "I wasn't sure about the hat, but now I'm excited about it."

Nicole Kidman paid tribute to a past collaboration with Lagerfeld by wearing the exact dress she donned in the Chanel No. 5 commercial nearly 20 years ago.

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Kidman, who enjoyed date night with husband Keith Urban, stunned wearing the blush pink gown. She reminisced with Anthony about the commercial she worked on with "Elvis" director Baz Luhrmann.

"I have the sketches when he was drawing it, then we fitted it," she said. "To be able to honor him and show Chanel, how these couture gowns last, and the exquisiteness and … to be able to wear the same thing 20 years later, and it still holds. It's light as a feather and hand made. It's couture."

Keith Urban dons a tuxedo while Nicole Kidman wears whimsical pink Chanel gown to Met Gala

Nicole Kidman and Keith Urban shared a special date night at the Met Gala. (Getty Images)

Margot Robbie wears Chanel gown first made famous by Cindy Crawford at the Met Gala

Margot Robbie channeled her best Cindy Crawford in a Chanel gown. (Getty Images)

Margot Robbie also looked back to the classics and wore a remake of a black gown with a sheer corset first seen on Cindy Crawford in 1993.

It was date night for a few of Hollywood's favorite couples. Pierce Brosnan and Keely Shaye Smith walked hand in hand on the red carpet. Brosnan looked sharp in a suit, and wife Keely stunned wearing a see-through black cape over a latex dress.

Hugh Jackman wore a black suit while wife Deborra-Lee Furness rocked a shimmering black turtleneck gown with mirror-mosaic pieces.

Salma Hayek pulled out all the stops wearing a red Gucci number complete with a latex corset and sheer lace skirt including tiers of ruffled tulle. Her husband, François-Henri Pinault, stayed close to her side throughout the glamorous event.

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Kim Kardashian wanted to be "feel glamorous" for this year's event, and opted for an ornate Schiaparelli gown. "We wanted to just be dripping in pearls," she said on the red carpet. The mother-of-four said her dress was made of "real pearls" and a few had fallen off along the way, prompting her daughter North to pick up the pricey baubles and save them for later.

Upon reaching the top of the stairs, Kardashian said the evening was full of emotions for their family. "Kendall really started her modeling career with Karl," she told their family friend, La La. 

Kendall, sporting a black sequin Marc Jacobs leotard with caped sleeves added, "It's amazing. Like Kim said, I think it’s a little emotional. I owe a lot to him. I'm honored to be here and to celebrate him."

Serena Williams wears black dress with pearls to announce pregnancy with husband Alexis Ohanian at the Met Gala

Serena Williams announced her pregnancy before walking the Met Gala red carpet. (Getty Images)

Model Karlie Kloss pregnant with second child shows off baby bump in tight black dress at Met Gala

Karlie Kloss revealed her baby bump at the Met Gala with husband Joshua Kushner. (Getty Images)

Pierce Brosnan smiles alongside wife Keely who wore black latex to Met Gala

Pierce Brosnan and Keely Shaye Smith matched wearing all-black ensembles. (Dimitrios Kambouris)

Kim Kardashian showed her shapewear with pearl dress at Met Gala

Kim Kardashian showed some skin wearing thousands of pearls fashioned into a dress. (Getty Images)

Hugh Jackman shows off beard while wife Deborra-Lee rocks skin-tight black gown at Met Gala

Hugh Jackman and wife Deborra-Lee Furness share the look of love at Met Gala 2023. (Matt Winkelmeyer)

Kim Kardashian wore real strands of pearls fashioned into a dress, while sisters Kendall and Kylie sported black and red dresses

Kendall Jenner, Kim Kardashian and Kylie Jenner walked the Met Gala red carpet together. (Kevin Mazur)

Salma Hayek and François-Henri Pinault attend Met Gala in style

Salma Hayek wore a crimson Gucci ensemble for Met Gala with her husband, François-Henri Pinault. (Getty Images)

The youngest of the Kardashian-Jenner brood, Kylie Jenner, was a vision in a fiery red Haider Ackermann gown with a purple satin train which doubled as a coat.

"I'm looking forward to making more memories," the makeup mogul said. "I'm here for a good time, maybe a little tequila." 

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Amanda Seyfried rocked a short beaded Oscar de la Renta dress covered in gold and diamond chains.

"The Marvelous Mrs. Maisel" star, Rachel Brosnahan, kept things a little more simple with a see-through black gown with strategically placed rhinestones covering her nipples.

Olivia Wilde found herself in a fashion faux-pas on the most important night of the year when Margaret Zhang, editor-in-chief of Vogue China, rocked a black version of the cut-out Chloé gown.

Rachel Brosnahan sports sheer black dress and Amanda Seyfried dazzles in beaded nude dress at Met Gala

Amanda Seyfried wore a daring beaded gown, while "Mrs. Maisel" star, Rachel Brosnahan went almost completely sheer at the Met. (Getty Images)

Margaret Zhang and Olivia Wilde wear same Chloe dress at the 2023 Met Gala

Olivia Wilde and Margaret Zhang walked the 2023 Met Gala red carpet wearing different versions of the same Chloé dress. (Getty Images)

Jared Leto wears furry cat suit on Met Gala red carpet

Jared Leto, who portrays Lagerfield in an upcoming biopic, paid homage to the designer in a catsuit. (Jeff Kravitz)

Doja Cat used facial prosthetics for cat-like features and Lil Nas X goes naked under glitter at Met Gala

Doja Cat transformed into a cat, while Lil Nas X glittered in silver sparkles at the Met Gala. (Getty Images)

Florence Pugh revealed a buzz cut on Met Gala red carpet

Florence Pugh shaved her head before the Met Gala. (John Shearer)

Jared Leto went literal with the theme and rocked a full furry costume to represent Lagerfeld's beloved cat, Choupette.

He was not the only one to catch a case of the kitten as Doja Cat showed up wearing prosthetics to transform her face into cat-like features.

Lil Nas X went for head-to-toe shimmering silver by makeup maven Pat McGrath for the red carpet.

Florence Pugh revealed a freshly shaved head at her Met Gala debut. The "Don't Worry Darling" star wore a massive feathered headpiece to match her Valentino gown. Pugh's love for the brand recently landed her a new gig as Valentino's ambassador.

The Lagerfeld gallery at the Met will also be on display to the public from May 5 through July 16, 2023.

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