The bra top

The bra top is busting through as fashion and Hollywood's hottest accessory from Cate to Kim to Kristen and Karlie to J.Lo and Lea to supermodel sisters Gigi and Bella.

Celebrity stylist and author George Brescia explains how to do the look properly. Whether you wear it over -- under -- or somewhere in between, Brescia says the only rule here is whatever makes you feel confident.

And if done right, you can also mix the formal with the casual.