Rachel McAdams on the cover of Vogue's January 2010 issue.

Rachel McAdams charms in Dolce & Gabbana on the cover of Vogue. Photo: Mario Testino

Brainy beauty Rachel McAdams is Vogue's January cover girl, where she sizzles on the front of the fashion bible in a mismatched silk floral-print bodysuit and pencil skirt by Dolce & Gabbana with a ballet-inspired fitted cardigan to top it all off.

The fun article that accompanies the gorgeous Mario Testino-photographed fashion spread -- think artfully tousled updos, lots of red along with waist-cinching corseted pieces by Dior and the aforementioned Dolce & Gabbana -- the reclusive Canadian star opens up to Vogue's Sally Singer in an interview that reads like a series of entries from "Keel's Simple Diary," of which McAdams is a fan.

In the article, which you can find in its lengthier form at Vogue.com, we discover that 31-year-old McAdams is refreshingly down-to-earth, favoring cooking classes, yoga, soap operas and taking long walks to the 'look-at-me' antics of other Hollywood starlets.

The actress -- who launched to stardom in "The Notebook" and is now co-starring in the blockbuster "Sherlock Holmes" alongside Robert Downey Jr. -- also reveals that she's not a fan of fussy fashion and beauty.

She even admits that after she received a Proenza Schouler tie-dye T-shirt that hadn't even hit the runway yet, she promptly wore it to bed.
Rachel McAdams in red Dolce & Gabbana in Vogue's January 2010 issue.

Rachel McAdams wearing Dolce & Gabbana in Vogue's January 2010 issue. Photo: Mario Testino

"My mother never put an emphasis on looks," McAdams tells Singer. "She let us grow up on our own time line. She never forced any beauty regimen into my world."

The currently single actress says, because of that lack of regimen, she was teased in high school for not shaving her legs.

"Why didn't you tell me?," the star says she asked her mom, before getting the reply: "Once you start, there's no turning back.".

To read more of the McAdams interview, where she discusses working with Lindsay Lohan on the set of "Mean Girls," her enthusiasm for green living and her soap opera obsession, visit Vogue.com and pick up the January issue of Vogue, on newsstands Dec. 22.

Also, be sure to check out the Vogue.com behind-the-scenes's video of the elegant fashion story.