How do I get rid of my excess belly fat? ASAP

So I have for the last 6 months accumulated this donut in the front of my stomach. It shows through clothes and I look chubby around my waist. I just want to know how to get rid of that and make it look smaller.

I have an event coming up in 3 weeks where I have to wear a dress so I want to have a more slender stomach that won't pop out.

Now I don't mind having extra meat in some places (trying to practice body positivity) BUT I just want to have more shape not just a pouch that is BIG you know??