The 32-year-old held a sophisticated party on June 2 to celebrate 60 years of the British Queen's reign, reported Daily Mail.
Brook posted the picture of herself with grey hair, a dazzling crown and diamond jewellery on micro-blogging site Twitter, with a caption, 'Queen for the Day'.
The brunette beauty, who designs her own clothing range for the high street store, was not the only one to fancy herself as a royal. There were employees from the headquarters dressed in a white lace dress and crown with the words 'Our office Kate'.
