Some of your favorite stars debuted new looks this summer -- a few changed their hair while others completely transformed their bodies. Click through to see how some of the biggest stars like Christina Aguilera, Thalía and even William Levy showed off their makeovers this summer.
Christina Aguilera has been struggling with her weight since the birth of her son, but this summer she was determined to stick to her 1,600-calorie-a-day diet and get back in shape. The singer debuted her fab new figure at an NBC event sporting a pink dress that highlighted her shrinking waist and toned leg. Go, Xtina!