Shailene Woodley's Faultless Fashion Transformation

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The "Fault in Our Stars" actress has become a megastar on the red carpet, and as her stylist Ilaria Urbinati puts it, "Now designers are dying to dress her."

Gangly girl-to-megastar metamorphoses have been seen before: Jennifer Lawrence before and after her association with Dior, for example. But none has been as swift and surprising as that of Shailene Woodley, 22.

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The outdoors-loving au naturel girl, who sported rather nondescript clothes with long shaggy hair during the 2011 promotion of The Descendants, did a chic 180 starting with Divergent in March and continuing with The Fault in Our Stars. Her sandy locks were hacked off by Fault hairstylist Nancy Kessler, who tells THR, "It makes her eyes really pop when she slicks it back." (Hairstylist Jamal Hammadi and his organic hair products keep up the look.)

Woodley then hired stylist Ilaria Urbinati (Nina Dobrev, Bradley Cooper) two days before the Divergent premiere. "If it was anyone else, I would have said no," saysUrbinati. "Because short hair makes everything look cooler, we went with girlier clothes and lots of color, which she had never done. The Divergent looks were simple silhouettes, strong and tough, to reflect the character," including a turquoise Stella McCartney for London and a white Zuhair Murad with strong shoulders for Berlin.

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"For Fault," adds Urbinati, "we went for younger, sweeter looks. Since her hair was more Rosemary's Baby, we did shifts, a more '60s silhouette," among them a tight, blue print Preen for the Miami premiere. The Fault piece de resistance was a strapless yellow Ralph Lauren peplum gown for NYC. "She's set on staying true to herself," says Urbinati about Woodley only wearing her own necklace and refusing to carry a clutch.

As for her makeup, Gloria Noto gives her a bold lip, "which works with shorter hair and bolder clothes." Urbinati states that "now designers are dying to dress her" -- so much so that she has accepted an invite to attend a major fashion show in October.

See Woodley's transformation on the red carpet, here.

This story first appeared in the June 27 issue of The Hollywood Reporter magazine.