Why is Halloween so big this year? We've got seven reasons it's the hugest Halloween in ages, so check out our PopSugar Rush Special! In case you missed part one, watch it here, or just jump right in to see the sexiest celebrity costumes, how to make the perfect festive cocktail, and some dress-up ideas from our editors! Paris Hilton and Lauren Conrad love to get dressed up, and check out what Kristen Bell, Rachel Bilson, and Audrina Patridge told us about their costumes. Watch part two of the PopSugar Rush Halloween Special now!