Deborah Cox (born July 13, 1974 in Toronto, Ontario) is a Canadian R&B/pop singer, whose 1998 song "Nobody's Supposed to Be Here" was the longest-running number one single in the history of Billboard magazine's R&B charts. Cox has achieved nine number-one hits on Billboard's Hot Dance Music/Club Play Chart.
Cox entered the music industry as a backup vocalist for CĂ©line Dion, and after signing to Arista Records, released her self-titled debut album in 1995. The album made her a rising star, and set the stage for 1998's One Wish. The first single from that album, "Nobody's Supposed to be Here", spent fourteen weeks at number one on Billboard's Hot R&B/Hip-Hop Singles & Tracks chart, a record broken by Mary J. Blige's Be Without You in 2006. While Cox began her career strictly as an R&B artist, she is now more well-known for her work in the dance/techno genre.
Her third album, The Morning After, was released in November 2002.
On February 17, 2004, Cox made her Broadway debut in the Elton John-Tim Rice musical Aida.
Cox has performed her songs at "New Year's Eve" in Los Angeles on December 31 2005 .
Deborah Cox is currently recording a new album with an expected release date of summer 2006. Her current single "House Is Not A Home" hit number one on Billboard's Dance/Club Play chart in January 2006.