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Billie Eilish Rocked a Sexy Mrs. Claus Costume at Her Star-Studded Birthday Party

The Grammy award-winning singer turned 21 on Dec. 18.

Ananya Panchal

Billie Eilish attends The 2022 Met Gala Celebrating “In America: An Anthology of Fashion” at The Metropolitan Museum of Art.

Billie Eilish turned 21 on Dec. 18! And she slayed (or should I say sleighed) her birthday outfit. The seven-time Grammy award winner shared a series of sexy photos from her party, a star-studded event including Rebecca Black and Justin Bieber. Eilish’s brother Finneas O’Connell, who co-writes a lot of her songs, and his girlfriend, YouTuber and actress Claudia Sulewski, also attended the event to celebrate Eilish’s milestone.

The “Happier than Ever” singer captioned her Dec. 21 post, containing a few pics taken by photographer Mason Poole, with a series of hearts on fire and present emojis. Eilish wore an off-the-shoulder Mrs. Claus-inspired red-and-white mini dress featuring a cropped cape shawl and fur trimming. 

Her dark hair was lightly curled at the bottom, and she wore candy-cane patterned hoop earrings. Eilish also sported the new “puppy liner” trend, which includes heavy black eyeliner on the lower lash line.

Eilish also included a few photos with her new boyfriend, Jesse Rutherford. In one snap, the two are seen leaning toward each other and trying to touching noses, recreating a classic Santa and Mrs. Claus pose. In another photo the couple is seen posing cheek to cheek with Justin and Hailey Bieber. 

Sulewski, who has been dating O’Connell since 2018, posted an adorable carousel of party snaps.

“have yourself a billie little christmas,” the I Love My Dad star wrote.

O’Connell, 25, also posted a sweet photo for his little sister’s big day.

“I’d take a bullet for you any day,” he wrote. “Love you so much billie, happy birthday.”

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Ananya Panchal
ANANYA PANCHAL

Ananya Panchal is a writer on the Lifestyle and Trending News team for SI Swimsuit, where she covers fashion, beauty, pop culture and the internet’s favorite personalities and trends. She joined the brand in 2022 after roles at Bustle, the San Francisco Chronicle and the TODAY Show. Panchal loves to write about fashion in all its forms—from standout runway moments and evolving street style to the best accessories to elevate each season’s wardrobe (she rarely goes anywhere without a stack of jewelry and a coffee in hand). A self-proclaimed beauty fanatic, she’s always on the hunt for must-have products and loves breaking down viral trends. Her favorite series at the moment is spotlighting female founders and the stories behind the brands they’ve built—especially those shaping the future of fashion, wellness and tech. She is based between New York City and San Francisco and, when she’s not writing, can be found rewatching One Tree Hill, playing sudoku, trying new restaurants or ranking her favorite Disney Channel Original Movies. She holds a bachelor’s degree in communications and journalism with a minor in criminal justice from Boston University.

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