Specifically focusing on when you need to lose the weight by, this Women's Health special features strategies to lose that weight in 4 weeks. Click on the link in this paragraph to get to the diet...then start with week one and you're on your way! But don't take it from me...here's an excerpt from the intro to the diet plan:

"So your trip to Mexico is a month away and you've got to fit into that itty-bitty red bikini you bought in a size too small (hey, we all do it). You know starving yourself isn't healthy or smart -- one sip of strawberry daiquiri and those pounds you lost will reappear faster than it takes Britney Spears to check in and out of rehab. Emergency liposuction? Also not an option. That's where we come in. We've designed three eating and exercise plans to help you hit your deadline -- whether it's 1 week, 1 month, or 3 months away -- without wrecking your health or driving you insane. You'll fit into that purple taffeta bridesmaid's dress in no time (lucky you!)."

Go for your goal! Go for the Deadline Diet!