Trim Mahalia in fine shape Singer-songwriter and The Voice contestant Mahalia Barnes on her weight loss battle. Mahalia Barnes shows off her new, trim shape Source: Supplied NO matter how much weight she loses, Mahalia Barnes says she will always embrace her curves. The singer, daughter of legendary Cold Chisel rocker Jimmy Barnes, has lost 17.2kg since signing on as an ambassador for Weight Watchers and from today will be seen in a new television commercial for the company. "I am all for embracing what your natural shape is," the mother of three-year-old Ruby tells Confidential. I have always been curvy. That is my shape and that is who I am but it is important to be healthy.