The 40-year-old, who was joined by husband Jamie Hince, showcased her glamorous style in a black faux fur jacket, paired with a sheer navy blue top with sequinned embellishment.
Kate Moss showed off he style credentials at the Melissa flagship launch
Kate added further sparkle to her outfit with some dazzling rings and bracelets, as well as a black clutch purse with gold and burgundy embroidered detail.
To complement her glitzy tops and accessories, Kate kept the rest of her outfit fairly classic in skinny black trousers and ankle boots.
The British style icon also channelled this effortlessly chic look when it came to her beauty. Choosing a dramatic sweeping black eyeliner on her eyes, Kate kept the rest of her makeup to a minimum, and wore her sleek blonde hair down past her shoulders to show off her oversized black hoop earrings.
Kate and husband Jamie Hince later headed to another party
Not only was the striking blonde's outfit ideal for a fashionable flagship opening, it also had a rock-chic feel, making it the perfect choice as she later headed with Jamie to an after party following the opening of Bob Gruen: Rock Seen at the Huntington Gallery.
Kate was not the only British model to step out for the flagship's launch. Georgia May Jagger revealed her girly side in a black velvet mini dress, keeping her makeup colourful and light for a fresh-faced look.
Georgia May Jagger wowed in an LBD at the event
It seems that the 22-year-old, who opened Marchesa's Spring 2015 show at London Fashion Week, has gained a strong fashion following including some of the industry's biggest names.
"Georgia May Jagger is one I like to watch," supermodel Cindy Crawford recently admitted. "Her pictures are beautiful but also interesting."