Harper, who will be turning 12 on Monday, celebrated in style at the fashion house’s Prade Caffè in Harrods with her nearest and dearest.
The only daughter of the couple wore a silk dusty purple slip dress from Victoria’s label which is unavailable on her website.
She teamed the elegant gown with a pair of white trainers with bright pink laces and high Nike socks.
Slung over her shoulder was her birthday present, a Prada Re-Edition handbag worth £950.
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Victoria, 49, was bursting with pride as she shared a selection of snaps from the family’s day out.
She wrote in the caption: “Harper Seven is 12!! (almost) Prada party for Harper Seven CHIC!”
In one of the photos, Harper beamed as she sat beside the former football ace in the luxurious cafe.
Harper’s brothers Romeo, 20 and Cruz, 18 also joined her for the fancy trip.
Victoria’s followers praised Harper for “dressing like a 12 year old”, and for showing her natural beauty.
“Bloody lovely to see a well dressed no make up young person. She’s a credit to you both,” one wrote.
“You can just tell that she’s a genuine good kid! Happy birthday Harper!!!” echoed a second.
A third added: “Seeing a 12yr dress like a 12yr should. happy birthday harper.”
Harper was also wished a happy birthday by Victoria’s famous pals, including Marc Jacobs.
Harrods’ Instagram account also commented on the photos of the lunch.
Victoria showed off her sunkissed skin in a strappy black floor-length dress, which she secured with a belt.
She added a pair of sandals and let her long dark hair flow past her shoulders in waves.
Romeo showed off his arm tattoos in a white graphic t-shirt and his trademark silver chains around his neck.
Cruz, who has become known for his quirky dress sense, wore a pair of hot pink sunglasses and a purple shirt.
Harper blew out the candles on a huge red velvet birthday cake with “Happy 12th Birthday Harper” written in icing on the top.
Prade Caffe opened in March this year and will close its doors at the end of 2023.
According to Harrod’s website, the cafe is “inspired by Prada’s most famous stores – including its first-ever boutique, opened at Galleria Vittorio Emanuele II in 1913 – Prada Caffè promises a taste of Milan in Knightsbridge.”
In a subtle nod to the brand’s monochrome designs, the cafe has black and white chequered flooring which is framed by pistachio green walls.
Elegant lights are draped from the ceiling and there is a glow of soft pink to compliment the green.
The space serves a range of brunch offerings including avocado toast for £10 and yoghurt and granola for £13.
There is the option to add caviar to the food for an eye-watering £22.
For those with a sweeter tooth, the restaurant serves a range of different cakes which will set diners back £15.
Brooklyn, who lives in Miami with his wife Nicola Peltz Beckham, was absent from the gathering.
