From Wikipedia, the free encyclopedia. Deborah Cox (born July 13, 1974) is a Canadian R&B singer-songwriter and actress. Her 1998 song "Nobody's Supposed to Be Here" held the record for longest-running number one single on Billboard's Hot R&B/Hip-Hop Singles & Tracks chart (14 weeks), a record held for nearly eight years. She has achieved ten number-one hits on Billboard's Hot Dance Club Play cha... show more