How to lose 10 kilos in 2 weeks?

Well I know this is unhealthy but I didn't come here for people to tell me that so please don't. The thing is that in 2 weeks time me and my family areflying over to Brisbane for a very big and expensive weddign and I have some really special dresses from a different culture that were made in January and since then I have gained about 10 kiols and all in about 6 months!! so I badly need to lose the 10 kiols in about 2 weeks or the clothes won't fit and I will be wearing scabby clothes I wouldn't even wear at home. The problem also is that i Have a cousin who is really skinny and my mum always compares me to her which always puts me down=( I really need to lose this weight or else!!!! please help and don;t say it is bad.