Kate Moss and Jamie Hince joined celebrities like Simon Cowell and Kirsten Dunst to celebrate Topshop at a private dinner in London last night. The supermodel is back in England for LFW after heading to Rio de Janeiro with her friend, photographer Mario Testino, to shoot a new fashion spread. Kate also brought Jamie along for the trip, which included bikini time by the pool. The duo are still glowing from their recent engagement news, and Kate poked some fun at their status when Topshop's CEO Phillip Green congratulated the pair at yesterday's dinner. Kate and Jamie are reportedly planning a Summer wedding, and she's rumored to be putting her experience with the brand to use by designing her own dress.