"It's a return to that old-fashioned sense of glamour," McGrath tells StyleList.
From the Spring 2011 runways of Gucci, Christian Dior and YSL to the catwalks of Givenchy, Louis Vuiton and Miu Miu, models sported vividly intense renditions of the classic shade, which brought a brazen sense of femininity to the collections.
McGrath -- who is a backstage fixture on the international fashion week circuit -- says that anyone can pull off the saturated hue.
"Women have their own idea of what they love, and I recommend wearing red in the way that makes you feel comfortable. Red can be worn as a glaze, a stain, a sheer gloss, a full-on lipstick," advises McGrath.
At Gucci, neutral makeup with a touch of shine on lids allowed satin red lips to take center stage, while the Dior and Miu Miu runways saw a strong swipe of winged eyeliner paired with the lip.
Meanwhile, at YSL and Givenchy, impeccably clean and near-naked skin made the red lipstick look as though it was bursting off models' lips. At Louis Vuitton, "more is better" was the creed, with a gold-dusted, metallic cat eye paired with a deeper aubergine lip and contoured cheekbones.
"The simplest way to wear red is to pick the shade you like, and then just pair it with tons of mascara," says McGrath.
We can hardly wait to rock those red lips come spring.
Want some instant gratification? Check out the new sample-stuffed black lace bag Charlotte Ronson designed for Beauty.com.