Heidi Klum's Instagram post sparks controversy with exposed thong.

Heidi Klum has joined the list of celebrities who have embraced the exposed thong trend, sharing a video on Instagram of her wearing a backless gold chainmail party dress with a black thong poking out the top. Other celebrities who have rocked the trend include Dua Lipa, Hailey Bieber, the Kardashians, and Bella Hadid. The Y2K revival has breathed new life into the divisive trend, with fans and critics alike.