Last two KGs!!

I know I eat chocolate as part of my 1200 a day or eat it when i have calories to burn but why oh why wont the last two pesky kgs just leave me already!

I work out 3/4 days a week (varied circuit training - different exercise every time) and I am sooo rarely out of my allocated points but still i have been stuck for around a month at 59kgs when my target is 57kgs.

Any advice for getting over the finish line? Anybody else experience the last few kgs as the hardest?

My fiance is on this site aswell and two kgs before his target he has decided he is sticking to maintain as he just hit a wall.
I am feeling his pain but dont want to give up so close to the end!
Help!