Jordin Sparks is not just a fan of the hip-shaking workout; she's a devoted Zumba class attendee. The American Idol-bred singer credits her recent weight loss (rumored to be around 30 pounds) on becoming more active, including taking Zumba classes with her mom. "Something just clicked with me, and instead of sitting around talking about it I said, 'I'm going to go hike that mountain!' And it continued. I've been hiking and I've done a couple of runs. I also do Zumba. It's so much fun!" she said.