but, dr. moreno says, if you fall off the diet, get right back on. and so i did, with gusto, until day 14. i am getting sick of the diet, rob. i'm starting to feel. >> how many days? >> i have three more days. >> why are cheating with this big bag of m&ms? >> i cannot eat any more yogurt or green tea. >> what about vegetables? blueberries? >> b >> reporter: but i was very disciplined for the last three days. and finally, day 17. when i hobbled over the day 17 finish line, i did it in my prepregnancy jeans. okay, ready? ready? >> so what happened? >> oh, oh! >> are these the skinny jeans? >> look at it, yeah. ♪ >> congratulations. you're back. >> i'm not kidding. i will not say not a muffin top when i sit down. >> oh, please. >> but standing up they look