SPOTTED: Superstar American Idol alum Jordin Sparks performing at an outdoor concert at The Grove in Los Angeles, August 1, 2012. The event was part of the outdoor mall’s Summer Concert Series, sponsored by Citibank.

The sexy songstress and star of the upcoming movie, Sparkle (co-starting the late Whitney Houston), showed off her sizzling new toned-down body as she performed to one hit after another.

Sparks who is now 50 pounds lighter than she was just last year recently told SHAPE magazine that she experienced a wake-up call at age 21 when she realized that despite having it all, she was always sick, tired and suffering from walking pneumonia.

“I just wanted to be healthy,” she told the mag. “I remember thinking, ‘I’m in my prime. I should be happy and fit.’ That was the moment I decided that changes needed to be made.” Sparks lost the weight at first by simply walking. She then slowly kicked things up a gear by hiking, then joining a gym and taking up Zumba. All her efforts have definitely paid off as the singer not only looked and sounded amazing, she also seemed the happiest I’ve ever seen her.