How do I get a body like Vanessa Hudgen or Ashley Tisdale or annasophia Robb?

Im not extremely over weight im between 155 and 170 at 5'7. Don't tell me im at my perfect weight for that height because i know its not by the looks of it. I refuse to take diet pills or go on any EXTREME diet so please help me!!! Nor will i do drugs or starve myself