How fast did you get back in shape after baby was born?

Just curious. Im 1 week postpartum and just realized i could fit into some of my pre-pregnancy clothing! :) Now i can't wait to lose the belly...and butt...and thighs...(although i wish i could keep the boobs, LOL) I know it takes alot of people over a year to get back their pre-pregnancy body, if they ever do, but has anyone out there done it in record time? Im going to start walking today, but im saving the real workouts for after 6 weeks.