On Sep 18, recently-married Vivian Hsu was promoting singing reality show, Chinese Idol, with fellow judges at a press conference.
During the media event, the 39-year-old star was so busy laughing and answering questions that she didn't realise her sitting position had revealed her panties.
She wore a bright pink dress that ended at mid-thigh, and while she was sitting down, her skirt scooted upwards.
Some fans said that the wardrobe malfunction is not her panties but possibly a slip, which is worn underneath clothes.
The second season of Chinese Idol 2 will premiere on Sep 21.