help with the stomach!

You can't spot reduce but you can work to tone in areas you want to enhance. Find a butt - building workout to keep your bootie

Do some strength training, particularly squats to keep the booty. Try Stronglifts 5x5. There's also another one by Bret Canteras (probably spelled that wrong but close enough to find it). You can't spot reduce, but making sure to maintain (you won't gain any if you're eating at a deficit, but you need to keep from losing what you've got) muscle will help you with burning more calories. I literally gained a pound this week but my waist lost an inch (Edit: I do Stronglifts 5x5 and a couple of dumbbell exercises, and again it depends on how you eat)

Best of luck!