Is this an emerging trend that escaped us? American Idol judge (that's J-Lo) and the X Factor USA judge (and that would be Nicole, in case you hadn't heard) went head-to-head in the style stakes in their similar uniforms of micro-mini dress and matching over-the-knee boots.
While Jennifer struck her best diva pose in head-to-toe snakeskin and sunnies, Nicole opted for a leather-look mini to match her black boots.
We want to know what YOU think! Which star rocked their thigh-highs best? Let us know below: