Mariah Carey shows her underwear underneath her skin-tight black leather outfit at UN Event

Mariah Carey was being Mariah Carey, even when she attended a formal event. Stepping out for an event honoring UN Secretary General Ban Ki-moon on Wednesday, August 10, the R&B diva put on a busty display in racy outfit.

The "My All" hitmaker sported a tight leather jacket which was unzipped to expose her black, sparkly bra. She completed her daring ensemble with black leather pants and platform heels. She arranged her long hair in wavy style and let it loose.