Despite being a Mandopop superstar, Stefanie Sun appeared every bit the "down-to-earth" Singaporean as she enjoyed a simple breakfast with her parents at a coffeeshop in Sixth Avenue. In a Xiaohongshu post on Aug 14, a fan shared photos of the 48-year-old singer dressed in a plain grey T-shirt, shorts and slippers in the non-air-conditioned coffeeshop which sells wanton noodles, kaya toast and egg tarts. Netizens took to the comments to praise her "down-to-earth" demeanour, with many appreciating her simple lifestyle. One netizen said: "Even superstars are just ordinary people. I absolutely adore the casual elegance of 'underrated…