Lifestyle Style What's Her Best Hair? See the stars' latest cuts and color changes – and then vote on which do suits them By Katherine Kluznik Rentmeester Published on August 12, 2009 09:00 PM Share Tweet Pin Email Trending Videos 01 of 32 MEGAN FOX NPX/Starmax; Jason Merritt/Getty The action star does a Transformers-worthy red-carpet switch-up of her own on the MTV Movie Awards red carpet in ‘09! The previous year, she had gone for stick-straight layers, but slicked back the top and let the ends trail in loose waves for this time around. 02 of 32 LAUREN CONRAD Landov; Juan Rico/Fame The former Hills star sends her soft waves packing, adding chunky texture and extra inches on the MTV Movie Awards red carpet. 03 of 32 NICOLE KIDMAN Bryan Bedder/Getty; Asadorian-Mejia/Splash News Online For over a year Nicole’s made pale blonde her signature look, but the actress returns to her red roots while filming in N.Y.C. 04 of 32 HAYDEN PANETTIERE INF; Fitzroy Barrett/Landov Everyone has their ups and downs – and the Heroes star takes hers in stylish stride, trying tousled waves at the Spike TV Guys Awards, then pulling her hair into a sleek updo at the MTV Movie Awards. 05 of 32 TARAJI P. HENSON Steve Granitz/WireImage; Jeffrey Mayer/WireImage Forget that classic bob the Oscar nominee wore at the Academy Awards! For the MTV Movie Awards, the actress goes rock ‘n’ roll, cutting her hair into a choppy, spiked style. 06 of 32 ASHLEY OLSEN Dennis Van Tine/LFI; Michael Jade/AdMedia The designer gives a jagged edge to her long blunt bob, adding choppy long layers for a film premiere in Hollywood. 07 of 32 MARION COTILLARD Dominique Charriau/WireImage; Jemal Countess/WireImage Taking her look from glamorous to chic, the Oscar winner straightens her waves into a polished bob. 08 of 32 MALIN ACKERMAN Landov; Chris Hatcher/PR Photos The actress goes ’80s-sleek at the MTV Movie awards by slicking back her blonde hair, before going wild the next night with tousled layers for a Hollywood film premiere. 09 of 32 ANNALYNNE MCCORD Dan Steinberg/AP; Jesse Grant/WireImage It was a weekend of whirlwind beauty for the 90210 star, who attended the Chrysalis Butterfly Ball with a striking bouffant-top updo, which she traded the next night for old-school Hollywood waves at the Young Hollywood Awards in Santa Monica. 10 of 32 JENNIFER LOVE HEWITT AP; Flynet The famously dark-haired star adds summery blonde highlights for the Monte-Carlo Television Festival. 11 of 32 SELENA GOMEZ Goff/INF; Gus Ruelas/AP “I cut it yesterday,” the Disney star told PEOPLE.com about her new highlighted bob. “I was sitting down in the chair, and I was going to ask for the same thing: little extensions, curling it, long.” But on the spur of the moment, she says, “I just cut it – cut it off! It feels good.” 12 of 32 HEIDI KLUM IC/Flynet; Juan Rico/Fame The supermodel proves just how sexy a bob can be at an event in her German homeland, before trying a summery updo at a charity event in L.A. 13 of 32 BEYONCé Mejia/Asadorian/Splash News Online; Peter Kramer/AP For months, was all about soft waves. But she’s taking summer’s warm weather in stride with more natural, ringlet curls. 14 of 32 EMILY BLUNT Jon Kopaloff/FilmMagic; Michael N. Todaro/FilmMagic The actress highlighted her chestnut locks by letting her hair down at the Sunshine Cleaning premiere, then pulled it back into a sleek ponytail to show off new red hair at a charity event in N.Y.C. 15 of 32 KATHERINE HEIGL Roger Walsh /Landov; John Shearer/WireImage hit the premiere of The Ugly Truth with brown hair that set off her dark eyes. 16 of 32 RIHANNA Saleem Elatab-AhmadElatab/Splash News Online; Anderson/Vila/Bauer-Griffin Taking Hollywood’s hair-shaving trend to bold new levels, debuted freshly shorn sides that added edge to her summertime look. 17 of 32 CIARA Astrid Stawiarz/Getty; Landov “Here’s my new haircut by Kiyah Wright!:) we teamed up!:),” the singer Tweeted this week of the short style that replaced her signature long tresses. 18 of 32 MICHELLE OBAMA Joyce Boghosian/Reuters/Landov; UPI /Landov entered the White House with a long, classic bob – but faked a shorter tucked-under style at a music event this week. 19 of 32 MEGAN FOX Anita Bugge/WireImage; Ramey While promoting Transformers: Revenge of the Fallen in Germany, went for major sex appeal with a long slick ponytail. But for the Armani Privé couture show in Paris, the sultry star goes for Old Hollywood glam with face-framing soft curls. 20 of 32 JESSICA ALBA Frank Micelotta/Getty; Neill J. Schutzer/Ramey trades in her dark brown locks for a new tousled light blonde do. 21 of 32 HAYDEN PANETTIERE Roger Wong/INF; Stephen Lovekin/Getty Changing hairstyles is all in a day’s work for the Heroes Panettiere starts the day with pin-straight platinum locks for an appearance on MTV, only to arrive at the evening screening of I Love You, Beth Cooper sporting loose waves and deep side part. 22 of 32 JESSICA BIEL Alberto E. Rodriguez/Getty; Alex J. Berliner/Berliner Studio/BEI The may have spent months with honey blonde highlights in her light brown hair, but at a fashion party this week she debuted a new red tint. 23 of 32 TAYLOR MOMSEN Astrid Stawiarz/Getty; Brian Ach/WireImage While on set as Gossip Girl’s new Queen Bee, adds length to her signature shaggy do with long blonde extensions done in a half-up style. 24 of 32 LAUREN CONRAD Astrid Stawiarz/Getty; BSB/TKB/ZOJ/WENN The gave up her signature hairstyle for a long brown bob – but only for the day while posing for a magazine. “I got to wear a brown wig all day,” she tweeted. “It [was] fun Kinda like playing dress up.” 25 of 32 KRISTEN STEWART Juan Rico/Fame; PR/Flynet You might be used to seeing with tousled auburn locks, but for her new role as singer Joan Jett, Kristen dyed her hair black and went for a choppy style that shouts, “I love rock ‘n’ roll!” 26 of 32 KIM KARDASHIAN Tyrone Kerr/FilmMagic; Todd Williamson/WireImage The hit the MuchMusic Awards with a tucked-under bob, which, she tweeted, was all about “channeling Marilyn Monroe.” But days later at a product launch party in Beverly Hills, she was back to her trademark lanky locks. 27 of 32 LINDSAY LOHAN Vince Flores/Celebrity Photo; David Tonnessen/Pacific Coast News The abandons her natural red hair for newly platinum tresses. 28 of 32 SCARLETT JOHANSSON Goff/INF; Michael Buckner/Getty The departed from the dark auburn hair that she wore for months and tried out a softer strawberry blonde look. 29 of 32 BRITNEY SPEARS Breeden/Thompsett/Pacific Coast News; Brewer/Splash News Online For weeks, the rocked dark brunette locks, but quickly went back to her signature blonde. 30 of 32 SOLANGE KNOWLES Jordan Strauss/WireImage; Splash News Online “I. just. wanted. to. be. free. from. the. bondage. that. black. women sometimes. put. on. themselves. with. hair.” the singer Tweeted after she removed the blunt-banged wig she’d worn to an event the night before and showed off a natural, closely-cropped do on the streets of L.A. 31 of 32 MISCHA BARTON James Whatling / Splash News Online; Jerritt Clark/WireImage The Beautiful Life’s gives herself a beauty makeover, darkening her hair from chestnut to deep brown. 32 of 32 JESSICA STROUP Dan Steinberg/AP; Phil McCarten /Landov The 90210 beauty chops off her wavy locks to create a softly layered bob.