From 1998 to 2003, Ellison played Emily Shadwick in the soap opera Brookside. In 2003, Ellison appeared in the travel documentary Jennifer Ellison does Thailand and in 2004, she appeared on the reality television show Hell's Kitchen, which she then went on to win. In 2005, she appeared on the celebrity challenge show With a Little Help From My Friends. In 2012, Ellison was a contestant on Dancing On Ice and made it to the semi-final stages.
After success in television and men's magazines, Ellison pursued a pop music career. She released two pop rock singles before giving this venture up for acting and glamour modelling.Her first single was "Baby I Don't Care", released in June 2003, which reached #6 in the UK Singles Chart. The song was originally released by Transvision Vamp in 1989. The following year in July, after being brought back into the public eye after winning Hell's Kitchen, Ellison released her second single, "Bye Bye Boy" - a song originally recorded by the Japanese singer Nanase Aikawa - which reached #13 in the UK chart