The LBD is a fabulous fashion staple even the most extravagant of stylists swear by, as we've come to learn from the likes of Lady Gaga, Jessie J and now from the adventurous X Factor judges. Tulisa Contostavlos has (thankfully) undergone a total style-over since the talent show began, and we really are very impressed with her new designer dress sense. We especially loved the ultra-short Vivienne Westwood sparkly number she donned with colour popping purple heels in one of the early shows, as well as this unusual floor length dress with rising hem and gold embroidered layered detailing. Although certainly no stranger to glamorous style, Kelly Rowland has also stepped up her game since the X Factor began and this Versace mini dress with green detailing gets a big 'yes' from us. However, its knicker-skimming hemline got an equally big 'no' from producers who have actually advised both of the X Factor starlets to tone down their sexy looks! Taking heed of this advice, this week Kelly stepped out in a full-length, sophisticated black evening dress.... with a very see-through cleavage and very ample cleavage to see through it! Do you think the X Factor ladies are pushing the LBD style boundaries too far and turning sophisticated into smut? Let us know on Twitter @TeamLBD or Facebook! Feeling inspired? Want some notice-me-now dresses in your wardrobe? Check out our eclectic selection of X Factor worthy frocks below....   [affiliate category_id=108 per_page=3 show_pagination=false]