HOW LOSE BELLY FAT AND TONE MY BELLY FAST IN 3 WEEKS? NATURALLY (WORKOUTS,DIET,ETC...)????? HELP?

MY sisters wedding is coming up on JULY 23rd. i need to loose my belly fat and tone it very good as soo as possible i already am doing the jillian michaels 30 day shred but it is not focusing on abs but i am going to continue doing this workout until the wedding. the problem is i havent even gone on a diet... i kno its stupid... but what r some foods that i should eat and the portions if i want to loose my belly fat fast...and any workout tips? i have a pouch on my belly and i need to work that off too.. im not skinny at all but im not huge and fat but i am like 20 lbs overweight.... so please anyone who has some advice let me kno im willing to do almost anything to lose the fat and tone my belly! but i cant do a fast or the master cleanse diet....i tried b4 and it was too hard for me... so any advice?