Abs-olutely! Summer's Sexiest Six-Packs

From Nick Jonas to Jennifer Aniston to Shakira, see which stars are impressing with their taut tummies

NICK JONAS

Look who's all grown up! The youngest Jonas took to Instagram July 30 to show off the positive side effects of eating well and exercising. "I never do this but... Healthy living and fitness update," he wrote, calling the snap a "Post workout picture."



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