The actress had several star-studded celebrations to mark her milestone birthday.
A birthday bunny! Kate Beckinsale is ringing in a milestone birthday in style. The Fool's Paradise actress celebrated her 50th birthday with a big blowout weekend of soirees.
On Saturday, she shared pics from her Playboy-themed bash rocking a black bodysuit, platform heels, a white collar and bowtie, fishnet stockings, and black bunny ears.
"Happy bunny birthday, my birthday twin @olivergliese 💕💕 🐰🐇🐰🐩😿," she captioned the pics from the event, posing with her pals dressed in on-theme getups.
Kate even poked fun at one commenter who wrote, "Are you a Lisbian?" replying, "Nine of your bisnis."
The celebrations didn't end there. Kate shared photos and videos from her star-studded parties throughout the weekend, with guests Demi Moore, Adam Lambert, Demi Lovato, Casey Affleck, and Jeremy Renner.
She posed in a $2700 Cavanagh Baker sparkly bodysuit complete with 25,000 hand-placed Swarovski crystals on stretch fishnet. Beckinsale paired the look with with a Nicole + Felicia feather cape, which included 2,500 ostrich feathers, diamond earrings by Anabela Chan, and a Self-portrait bow handbag.
"The idea behind this ensemble was to exude glamour and sparkle while ensuring a fun and lively vibe," the Serendipity actress' stylist, Gorge Villalpando, tells ET. "We wanted something that would not only showcase her elegance but also allow her to move freely and dance comfortably."
Later in the evening, Beckinsale wore a red velvet gown by The Blonds, and accessorized with a red Brandon Blackwood print bag. "Overall, I wanted to create a visual spectacle that truly captured the essence of the glamorous event while reflecting Kate's vibrant personality and style," Villalpando explains.
Even her birthday cake was inspired by one of her style statements. Dessert designer Tom Rosa tells ET that Beckinsale had them use a photo of her from this year's Cannes Film Festival red carpet because she loved that dress.
They used the color of her gown to match the flowers on her cake, and separate cupcakes were also made to match the cake itself. The cake took about five hours to make.
"Kate is such a free spirit and always wants something fun made for the events in her life," Rosa says.
"The most amazing birthday continues .. what a party -full of love and glitter and the best people," Beckinsale said of her swanky celebration. "Thank you to everyone and especially everyone 💕💕."