Kelly showed off her stunning slim figure while performing her new single, Dark Side, during the awards show.
How did Kelly lose the weight? With a tour and her show Duets coming up, she's a busy woman, for sure, but she's obviously made a big effort to shed the pounds.
Weight expert and author of The Accidental Diet: From Fugly to Fox, Alicia Hunter, tells HollywoodLife.com, "Kelly looks to have lost about 40 pounds," adding, "Her arms are a far, slimmed-down cry from her earlier picture and her face looks more defined too! She's also shed several inches from her waist."
In a word, Kelly looks great!
Alicia believes that Kelly is eating better, following a low-calorie meal plan, and doing a cardio workout.
Kelly's new series, Duets, premieres May 24 on ABC.
Gallery | 2012 Billboard Music Awards