Javine supports Jeans for Genes because of a family genetic disorder.
Javine Hylton, usually known simply as Javine, released her new single Don't Let the Morning Come this week and is currently starring in the musical Daddy Cool. A charity gala performance of the show last month raised £5,000.
This year's winner of the Rear of the Year accolade appeared in a fashion show to celebrate the tenth anniversary of Jeans for Genes in 2005. She then won Channel 4's gruelling The Games in March, raising about £10,000 for the charity.
A spokeswoman for the charity says: "Javine is a great supporter - she understands the issues, she appeals to young people and she always makes time for us."
The singer became involved with the charity partly because a genetic disorder runs through her family. She says: "A gene that can cause colon cancer has come down the generations. Just knowing it's there means we look out for signs of anything wrong. The research Jeans for Genes funds can make such a difference."
This year's Jeans for Genes Day takes place on Friday.