Despite the clouds, the model opted for a floral chiffon gown for a wedding in London, joined by other half Jamie Hince.
Standing out in bright red, the 39-year-old mingled with wedding guests including Sienna Miller who wore an equally eye-catching, tight blue dress.
Summertime chic: Kate Moss wore a red floral
gown to the wedding of her personal assistant in Camden on Saturday,
arriving on the arm of Jamie Hince
She threw a fitted black jacket over the dramatic dress and gave herself some added height in a pair of towering ankle-strap stilettos.
Having clearly put a lot of thought into her wedding attire, Kate wore a long scarf around her neck in the same print and material as her summery gown.
Seeking the sun: Kate looked ready for summer in the delicate chiffon dress, not exactly blending in as she breezed through town
Stand-out print: Sienna Miller wore a plunging blue dress for the London wedding, matched with a metallic clutch
As they emerged from the service, Kate stuck close to her best pal Sadie Frost, who looked a little less than summery in black trousers and a matching jacket.
Sienna, who seemed to be without other half Tom Sturridge, looked as summery in Kate in a calf-length blue dress with a plunging neckline.
Waiting for the couple: Sienna joined the other
guests who congregated outside the Town Hall to wait for bride Fiona
Young and her new husband
Seeing them off: Kate was joined by best pal Sadie Frost as they waved off the newlyweds
As usual the actress kept her make-up minimal and wore her blonde hair loose and tousled, seeming in a good mood as she chatted to fellow wedding guests.
But one encounter might have been a little more awkward as her ex-boyfriend Rhys Ifans also put in an appearance at the ceremony, lighting up a cigarette as he jumped into his car afterwards.
Famous friends: Sienna's ex-boyfriend Rhys Ifans also attended the ceremony, jumping in a car afterwards