Dig up the Dukan Diet on the internet and follow the Attack phase for 5 or 10 days and you will lose 5 kgs in a month and it won;t be just water.
Take a look at this: http://www.fatsickandnearlydead.com/
If you have netflix, you can watch the video for free (or just rent it). I've been on this for 8 days and the results are amazing!!!
Every morning and every evening you must be doing exercise. You need to be consistent.
Dieting + exercise + if possible some natural supplements will help you to reduce the weight.