Lose 7 pounds by Christmas?

weigh 120 pounds at 5' 4" right now. I want to lose 7 pounds in 7 weeks, which would put me at 113 by Christmas! That would be GREAT. I am an athlete, as I am a dancer. I am fit and admittedly thin, but I still want to lose the weight, so please don't tell me I don't need to. I just know that it is a lot harder to lose the weight when you are smaller. If anyone could give me a plan, or at least a layout of an idea, that would be great. :)