Celebrities have a tendency to wild out on Halloween because it's the one time of year when they're expected to let their guard down. Heidi Klum (center) usually goes the crazy route, whereas Carmen Electra and Mariah Carey stick to their usual sexed-up looks. Since most regular women don't dress seductively on a daily basis, Halloween gives them the best excuse for showing some skin. While most can appreciate a totally outrageous costume, donning a sexy get-up is a lot easier because many can be bought online. Keep clicking for 10 super-sexy and often ridiculous costumes available in a range of sizes.