Singer-actress Fiona Sit Hoi-kei flaunted her stick-thin body in a sleek one-piece dress at a Rado watch event at Harbour City. She was on hand on Monday to present awards to winners of a Radostar competition, for which young local designers were invited to submit artwork on the theme of 'Unlimited Spirit'. Sit was an obvious fit for the function as she studied design at Polytechnic University before finding her way into show business. But design is not the main thing on her mind at the moment. The petite beauty said she weighed just 47kg and wanted to be in tip-top condition for her concert next July at the Coliseum. She said her record was a mere 38kg a few years back. 'I've been jogging, cycling and weightlifting to get toned,' she said. But Sit has probably been overdoing it, as she recently fell off her bike, injuring her shoulder and shin. 'It was actually bad luck. I shouldn't have been on the phone while cycling,' she said. Don't be fooled by her frail frame, though. Sit is a tough cookie. 'I think girls look hotter when we build up some muscles,' she said. Maybe so, but we would not want to see the sweet girl-next-door star turning into a mini-version Arnold Schwarzenegger.