The fashion mogul celebrated turning 50 with an elegant soirée in London on Saturday, April 20

David Beckham and Victoria Beckham. PHOTO: JOE MAHER/BFC/GETTY IMAGES

Victoria Beckham is channeling her “Posh” alter ego to celebrate a milestone birthday!

As seen in various posts on Instagram, the fashion designer — who turned 50 on Wednesday, April 17 — celebrated her birthday with an elegant party at Oswald’s, a private members-only club in London, on Saturday, April 19. Ahead of the soirée, she shared a glimpse of her family’s stylish party attire.

“Can’t wait to celebrate with my friends and family! I love you all so much,” the former Spice Girls member, who performed as Posh Spice, captioned a carousel of photos shared on Instagram that showed her posing with her family in front of a fireplace.

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Victoria wore a sheer mint green gown with subtle ruching and floral details for the occasion.

Her daughter, Harper, 12, looked all grown up in a chic, champagne-colored gown, while her husband, David Beckham, and three sons — Brooklyn, 25, Romeo, 21, and Cruz, 19 — wore dapper tuxedos.

Cruz chose to stand out among his brothers and father in an all-white look with a black bowtie, while the other men sported black suits.

Victoria’s friends and former Spice Girls members Emma Bunton and Melanie “Mel C” Chisholm also attended the event, per an Instagram post by Bunton, 48.

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“Off to celebrate our special girl @victoriabeckham #spicegirls #holdontoyournickersgirls,” the singer, who was known as Baby Spice, captioned a live photo of herself laughing with Mel C.

Bunton wore a black gown with white button detailing and an above-the-thigh slit in the photograph. Mel C, known as Sporty Spice, 50, wore a simple black one-shoulder gown to the elegant affair celebrating Victoria.

Other stars who stepped out to Victoria’s birthday party included Tom Cruise, Marc Anthony, Eva Longoria, Gordon Ramsay, Jason Statham and Rosie Huntington-Whiteley.

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The Beckham family. VICTORIA BECKHAM/INSTAGRAM

On her actual birthday earlier in the week, Victoria celebrated turning 50 on a yacht with David, model Cindy Crawford and Crawford’s husband, Rande Gerber, among other friends.

“Grateful for this crew. Let’s have some fun in the sun,” the Beckhams’ friend Jamie Salter, the founder, chairman and CEO of Authentic Brands Group, captioned photos of the gathering that he shared on Instagram.