My FAVORITE body..but i need help with it! 10PTS?

i really really like gwen stefani's body for some reason.. she has very nice straight legs and a flat stomach.. i want to know how i can get there in 4 months.. and if i loose about 20-25 lbs i can be there.. how can i do it? if i run on the treadmil an hour everyday would that help me drop 20 in 4 months??? (+diet) answers! xoxo 10pts