Mick Jagger's 39-year-old fiancee Melanie Hamrick leads best-dressed at British Museum Ball

Mick, 83, wore a blue silk shirt with black chinos, a patterned belt and a white jacket with a red handkerchief for a pop of bright color.

The event, which raises money for the British Museum, located in central London, has been described as the UK's version of the Met Gala; this year's theme was the color red, a "unifying thread woven through all three of the museum’s upcoming displays."

Mick's Rolling Stones bandmate Ronnie Wood was also in attendance with 48-year-old wife Sally in a gorgeous pink metallic brocade shirt dress with puff sleeves and a matching belt by Rebecca Vallance.

Activist Bianca Jagger – Mick's first wife – was also at the gala, and the 81-year-old looked fabulous in a black lace and tulle gown.

Lady Kitty Spencer  – in a striking red strapless gown paired with a matching draped cape and diamond jewelry – joined Marchioness of Bath Emma Thynn, who rocked a dramatic, strapless red satin gown featuring a structured sweetheart bodice and expansive floor-length train, on the steps of the Museum.

Benedict Cumberbatch arrived with wife Sophie, with the pair posing hand in hand. 

Sophie wore a striking Simone Rocha mini dress with red satin ribbon laced down the front, tied into bows at the bottom with loose ribbons while award-winning actor Benedict paired his classic black tuxedo with a burgundy scarf.

Also among guests was Glee actress Dianna Agron, who now lives in Paris, France, after a period in London. 

She wore a long, sheer black-and-silver floral-patterned dress by Erdem with a pink bow accent on the shoulder, an element the brand used in their S/W 2026 collection.

Gwendoline Christie was also in attendance, and followed the theme in what looked to be a burgundy Gemy Maalouf gown with a sheer cape and a bow detail at the neck.

Also joining the celebrities was rapper Wyclef Jean in a bold, long red formal tuxedo jacket with black peaked lapels and a black bow tie.

His daughter, Angelina Claudinette, looked stunning in a rich burgundy-red velvet, long-sleeved gown paired with an ornate, beaded headpiece and layered statement jewelry.

Sudanese-American model Adot Gak arrived in a dramatic embroidered black and red structural couture gown designed by Rahul Mishra.

Exhibitions at the museum include the loan of the Bayeux Tapestry from France, a display marking the 250th anniversary of the United States and a landmark exhibition exploring 2,000 years of Korean creativity.

According to the museum, proceeds this year will go towards its "masterplan" project, which includes overhauling its "outdated energy infrastructure" by phasing out fossil fuels and shifting to low-carbon energy.