Kristin Cavallari Really Crosses The Line

She's the brash girl everyone loves to hate on The Hills, but Kristin Cavallari isn't afraid to share her less-than-fabulous moments with Usmagazine.com.See photos of how the stars of The Hills have changed through the yearsIn this exclusive video, Cavallari tells Us about her Thanksgiving plans, her celeb crush ... and her most embarrassing moment -- period!"I don't know if this is appropriate," she warns.See photos of today's top news storiesThe blush-inducing memory? A photo shoot involving "little booty shorts and lingerie," a bold stylist and a feminine hygiene product.Curious? Watch the clip below!