Photo: Chris Craymer

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Happy Mix-Up
Sure, forest green for the holidays is traditional, but a mix of textures freshens this look. "The combination of a knit sweater and a sequined skirt is comfortable and dressy," says Strahovski, who will appear opposite Barbra Streisand and Seth Rogen in the upcoming film The Guilt Trip.

Beauty Advice: The Art of The Easygoing Updo
In the polished-yet-playful spirit of these looks, hairstylist Peter Butler swept Strahovski's natural waves into a loose updo.

For the faux-bob effect on the previous slide, Butler separated her hair into upper and lower sections (parting it from ear to ear on the back of her head). He pinned the bottom half into a chignon, then smoothed the upper section over it, tucking the ends underneath the chignon and securing them with bobby pins.

An even easier look is this messy French twist. To get the right tousled texture, Butler suggests using L'Oréal Professional Infinium 2 Hairspray ($24, lpsalons.com for stores) as a first step. Use as few pins as possible to secure the ends of the twist, and leave a couple of pieces loose around your face.

A headband can be a winsome finishing touch—if it's done right. The secrets to success: The band must be thin, minimally embellished (sparkle is acceptable for evening, but bows or flowers—never) and, for ultimate chic, worn no more than two inches back from the hairline. It's a brilliant addition to a loose chignon or twist because it instantly creates face-slimming height at the crown of the head.

Sweater, J.Crew, $650, jcrew.com. Skirt, J.Crew, $425, jcrew.com. Necklace (worn as headband), Rebekah Price, $380, goldphilosophy.com.