One of my colleagues auditioned for the show (on the geek side). The geeks are given a completely new wardrobe that they have to wear and are instructed to act as awkward or nerdy as required. It's a pretty safe presumption the same level of control is applied on the beauty side so don't feel too bad. It's all showbiz.
To top it all off, he actually got tapped on the shoulder to audition after the producers saw his video application for the Amazing Race.