I totally feel for you! my best friend got engaged earlier this year and ask me to be the 'slave of honor', and I had just started a new dietary change, and its been amazing, but a pain, but I've lost close to 70 lbs since she got engaged (and wedding is in less than two weeks) so it can be done! I am actually looking forward to seeing the photos now (even though I'm still quite large, at 267)
Best of luck!
short term goal:
IP Starting date: September 13th, '13
SW: 334, Now: Officially over 100lbs lost!