The most daring outfits celebrities wore to meet members of the British royal family

She paired the bold footwear with sparkling blue shorts and a white tank top that had blue sequins and a V-shaped neckline. She wore the ensemble to a Royal Gala held to celebrate the 21st anniversary of The Prince's Trust.

Prince Charles, on the other hand, donned a traditional black suit.

For a concert, the band wore drastically different outfits that represented their individual styles. Halliwell chose a red skirt, white crop top, and red platform heels, while Mel B wore gray velvet pants, a matching bralette, and white sneakers.

Emma Buton opted for a green minidress and platform sneakers, Victoria Beckham wore a white bralette under a pantsuit, and Melanie C looked athletic in a blue sports top, matching pants, and running shoes.

The Queen attended the Spice Girls' 1997 performance at London's Victoria Palace Theatre in a metallic, short-sleeved dress, mid-length gloves, and gold jewels.

The Spice Girls wore bolder looks. Emma Lee Bunton wore a white sleeveless gown, while Victoria Beckham chose a brown strapless dress with a short slit down the side.

Melanie C wore the most casual look of the group, which included a tank top, red pants, and sneakers.

Halliwell shook the Queen's hand while wearing a white halter gown, and Brown sported an animal-print bra, open shirt, and velvet pants.

For the De Beers/Versace "Diamonds are Forever" celebration that year, Hurley wore a sleeveless pink gown that was covered in sparkles. It had a plunging, scoop-style neckline, a thigh-high slit, and sheer panels on the bottom of its skirt.

Prince Charles went with his classic tuxedo look that night.

The two met at an outdoor concert held at Hyde Park in London, England. Whereas Prince Charles wore a gray suit and red tie, Kravitz wore a mesh shirt, a studded denim jacket, and an oversized knit hat.

West wore a gray-toned blazer over a tan shirt and red tie. He also wore white shutter shades, which were all the rage in the early aughts. Diddy also embraced the era's trends by wearing a navy jacket over a graphic T-shirt.

Harry and Prince William opted for more traditionally royal looks, which included button-up shirts, neutral-colored jackets, and casual pants with belts.

The two met after the annual Royal Variety Performance. The Queen wore a sparkling white dress, diamond jewelry, and carried a flower bouquet. Iglesias paired his denim pants with a black blazer and white button-up shirt.

She looked radiant in the orange design, which had a floor-length skirt, crisscross belt, and a tiny cutout across her waistline.

Cyrus, who was a host of that year's Royal Variety Performance, contrasted the Queen's sparkling black shawl, matching dress, and black gloves.

Her look that night included a red latex dress with a high neckline and puffy sleeves. Lady Gaga also wore pointed red boots, curled blonde hair, and exaggerated eye shadow embellished with makeup jewels.

Her green gown had a slit across her chest and shoulder, and another triangular cutout across her waist. She wore the dress for the 2011 BAFTA Brits to Watch event, where she met Prince William and Kate Middleton, who were both dressed like royalty.

Middleton chose a pastel dress with a ruched bodice, and the Duke of Cambridge opted for a classic tuxedo.

The model's look included a sleeveless dress with fabric that wrapped around her waist and tied into a bow across her shoulder to create an open back. She also seemingly wore a leather belt as a headband.

The Prince of Wales and the Duchess of Cornwall sported more subdued looks. The prince wore a blue suit and Camilla wore a white dress with a matching bedazzled jacket.

Lady Gaga and Tony Bennett were pictured meeting the Duke of Sussex before a gala concert in London, England.

Bennett went with a classic black suit and tie for the performance, while Lady Gaga wore a metallic long-sleeved dress with a plunging scoop-style neckline.

The musician also had her hair tied in a bun and wore jewels across her eyebrows.

Her outfit included a blue strapless dress over a long-sleeved, sparkling mesh shirt. She looked elegant while standing next to Prince Charles, who wore a black tuxedo, on a red carpet of a reception held for supporters of the British Asian Trust.