Can someone give me tips on losing weight?

I have been saving up for a pair of jeans from Buckle that are a whopping $100.00! Outrageous, I know. But I've been wanting and saving for them for such a long time. Here's the dilemma, I would like to lose some weight in my legs so I look my best in this pair of jeans. These jeans are kind of my "reward" for losing weight. The main areas in which I need to lose weight is my butt and thigh area. Any tips or suggestions would help. Thanks (: