Wanna lose weight but not to much!?

well i was wondering if u was ment to lose alot of weight would ur and bum get smaller or sumting cuz look at victoria beckhams wow does she look lyke a skeleton i mean y do that to ur self? anywayz i am a size 8-10 but wana be a size 6 i noe its ganna be ard bt im willing to try bt da thing is i dont noe da meaning of a diet anything i c dat looks delicous i will eat it i eat soo much bt wanna cut dnw any advise I LOVE FOOD lol