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.
In 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.
The blush-inducing memory? A photo shoot involving "little booty shorts and lingerie," a bold stylist and a feminine hygiene product.
Curious? Watch the clip above!