Leading the charge was glamorous model and designer, Kate Moss, who chose a sexy cream-coloured romper with tights and a suit jacket for the occasion.
Kate was joined by other fashion heavyweights, including Vogue editor Anna Wintour and models Daisy Lowe and Kelly Brook, who was accompanied by her rugby hunk boyfriend, Danny Cipriani.
Like many of the starlets in attendance, Kelly, who was stunning in a gold, strapless frock, followed Kate's lead in showing off a leggy look.
Also embracing the trend were X Factor winner Alexandra Burke and Girls Aloud singer Nicola Roberts, both lovely in shades of pink.
The guests were all treated to a sneak peak of Brampton Road's newest store, which offers a three-story shopping experience that currently houses Kate's latest collection, her twelfth for Topshop.
The supermodel's newest range features sheer, pastel fabrics and plenty of fun dresses and playsuits that reflect her own personal style, especially her love for short hemlines.
"Even if I've done something quite classic, I always want it shorter," she told a UK magazine. "I want things shorter and shorter."
The new range hits stores May 20 to coinicide with the opening of Topshop Knightsbridge.