Stunning in a sheer, lacy dress by the brand, Momsen toned the eyeliner down a notch and wore her hair in an elegant updo.

So what did she think of her first “official” show?

“It was f**king excuse me…It was beautiful. It was gorgeous,” she told E! News.

“There were so many [designs] I loved” she gushed.

As for why she likes the brand? “[It's] ladylike,” she said of Georgina Chapman and Kerin Craig’s creations. “[They make] you feel like a woman. Everything [they do] is beautiful and it crosses so many different styles. I think any woman can wear Marchesa and look beautiful in it.”