i'm quite sure you can, but would require vigorous excercise...i've lost around 11 pounds in 3 weeks unintentionally, but thats cos i exercise a lot every single day - not fond of the very skinny look, prefer to muscle-up myself a bit.. - and i only eat fruit & veg anyway, cos i'm a fruitarian.
if you try & do that by starving yourself, or some way without exercise it'll come back on very quickly afterwards, and would be very hard anyway... though if its just for a wedding then its fine i guess, *sigh* the cost of beauty...
& next time at least type "half" instead of "alf" if nothing else...
good luck with it anyhow!!