With all the star power at the BET Awards — Kanye West, Jay-Z, Nicki Minaj, Beyonce and Samuel L. Jackson, to name a few — the most stirring moment came not from a superstar, but from the mother of one.

Whitney Houston's mother, Cissy, provided the emotional highlight of Sunday's ceremony as she sang "Bridge Over Troubled Water" in tribute to her late daughter, leaving audience members like Beyonce and Soulja Boy in tears.

Mariah Carey opened the tribute, and her voice wavered as she told stories about Houston. She recalled the last time she saw Houston last year, and how the two laughed and gossiped together.