The bleaching of models’ brows was all the rage for S/S 2010 (and actually was fairly popular the season before at Prada, Balenciaga, and Miu Miu). We’ve been fascinated as to how all the girls’ eyebrows didn’t fall out by the end of Paris Fashion Week.

Today, we went to a Cover Girl lunch with the amazing (and always fun) Pat McGrath and got some answers.

First of all, we had no idea that Pat has had a hair colorist on her team for years. While he does many other things as well, brows often fall to him. Very cool. And considering the lady does around 30 shows a season (not to mention countless editorials and covers), it makes a lot of sense to have everyone you may need at the ready.

She told us that she suggested to the models that they not go through the bleaching process more than twice. Instead, the makeup teams would just color in darker versions when necessary. “Of course some girls insisted on always changing back, but what are you gonna do?” said Pat. We’re sure those ladies are regretting those decisions right about now.

We agree with Pat that playing around with brow color gives a different kind of variety to shows when you’re looking at so many every single day. And we love how the “no-brow” thing makes our favorite models look even more like gorgeous alien-like creatures than usual.

But would you ever try it? We’re thinking a little lightening might be fun—and as Pat noted, it really opens up your face. But going totally platinum sounds a little scary to us.