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.