updated 06/15/2011 AT 8:00 AM ET
•originally published 06/15/2011 AT 9:35 AM ET
“I’ve always felt cute, but now I feel sexier,” the singer says in the new issue of PEOPLE this week.
She credits her new figure to taking Zumba classes, scaling down her portion sizes and sticking to her new healthy lifestyle. Says the singer: “I was determined.”