Former American Idol favourite KIMBERLEY LOCKE is set to become the new face of U.S. diet company Jenny Craig. The 8th World Wonder singer has already lost 30 pounds (13.6 kilograms) on the plan and hopes to lose another 10 before her stint as a celebrity spokeswoman begins. It's not the first time Locke has gone public with her weight battle - she's a former contestant on U.S. reality TV show Celebrity Fit Club.