Celebrity reporter Kristen Aldridge reveals how SHAPE's August cover girl Jordin Sparks slimmed down and toned up. The singer and actress says she started off slowly with a routine of walking and jogging before picking up more high-energy activities like Zumba. Sparks says she loves to eat but has learned how to make healthier choices-and, boy, do the results show! Watch the video to learn more about how Jordin transformed her body, and check back here to find out who else made our list of the 10 Hottest Stars of Summer.