What is the best way to tone up my legs..hamstrings for the most part.?

I'm just an average size..5'4, 140 pounds. But my legs..mainly hamstrings are sooo flabby..i hate wearing shorts because you can see a little bit of cellulite..I'm a mother so its hard to find time to work full time, care for my kid, and take care of a husband and home. I'm very addicted to Sweet Tea, i'm wondering if that is contributing to my cellulite. Also i have the mirena IUD and was wondering if the "hormones" that are released have anything to do with my weight and cellulite.