Cheat sheet: Get the look of three super-chic Hollywood stars

Patti's attempt to copy Reese Witherspoon isn't exactly paparazzi-ready. The dotted shirt is more grandma than grown-up; the long skirt worn with low pumps doesn't do her legs any favors; and head-to-toe black, with no color oomph, is way too severe.

Her Style, Decoded: A petite powerhouse — she's maybe 5' 2" — Reese favors tailored, ladylike pieces and above-the-knee hems to elongate her legs. A trim collarless coat and mile-high platforms instantly boost her height.

Flaunt-It Hair: Behold the power of a blowout: Sleek and smooth, Patti's hair frames her face and sends a posh message

Supersize Shades: Strut like a star in huge sunglasses ($95, Warby Parker)

Less-Is-More Coat: A tad shorter than the skirt = chic

Bombshell Gams: With black heels and black tights, legs go on forever

Get the Look: This double-breasted stunner ($250, Lands' End) is Reese done right: Fitted, with all the embellishment above the waist, it doesn't swamp Patti's figure. It hits at mid-thigh, but with a dark skirt ($45, Jennifer Lopez for Kohl's), tights ($35, Plush Apparel), and pumps ($139, Vince Camuto), it's refined, not revealing.

Kristen is a mega-fan of Jennifer Aniston's clean-lined simplicity, but she interpreted that to mean...bland basics. The boxy cardigan and khakis are mannish, and the flat footwear isn't helping, either.

Her Style, Decoded: Never swayed by trends, Jen is loyal to close-cut neutral classics that show off her figure, like the skinny jeans above. Adding sizzle: suede boots with a stiletto heel.

A Malibu Mane: Kristen's wow new 'do mimics Jen's trademark locks — long and loose, with sun-kissed highlights

Knockout Blouse: Unbuttoned to show some skin — yes!

The Power Trench: Black instead of tan is way cooler

Insta-Slim Jeans: Tuck into high boots ($159, Nine West). Presto: svelter legs

Get the Look: Bye-bye, baggy! In a body-conscious darted blouse ($47, The Limited) and stretch denim skinnies ($88, It Jeans), Kristen nails Jennifer's California-casual vibe. A three-quarter trench ($178, London Fog), worn open, is an easygoing topper with forever appeal.

A free spirit, Risa loves anything boho, just like Julia Roberts. But this time-warp outfit, with its drab colors, droopy proportions, and out-of-date accessories, is stuck in the seventies.

Her Style, Decoded: An unabashed granola girl off the red carpet, Julia sticks to low-key, unfussy staples with a global twist. She introduces some bohemian cool through pattern and texture — check out the embroidered blouse and handcrafted bag above — for one-of-a-kind ensembles. Her best accessories: that megawatt smile and glossy hair.

Smooth is Sexy: Nice! With her unruly ringlets tamed, Risa's straightened hair is now as polished as the rest of her updated outfit

Top Tunic: In white-on-white, it's hippie meets haute

Notice-Me Bag: Here's the hit of color and texture ($32, Blue Plate)

Dressed-Up Denim: Dark and lean, these knock off 10 pounds

Get the Look: Pared down but still flower-child fab, Risa's eyelet-trim tunic ($60, Blue Plate) mixes well with understated dark jeans ($55, Aeropostale) and a laid-back beaded necklace ($156, Raven & Lily).