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Rihanna - Just when we start to think the shaved sides hairstyle ship has finally sailed (without Cassie, who will apparently never let it go) someone resurrects it again. On April 2 Rihanna showed off long, jet black hair while promoting her upcoming film, Battleship, in Tokyo and kept it from being tame by shaving off a side. (Photo: REUTERS /YURIKO NAKAO /LANDOV)

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Pepa, circa 1989 - Much has been said lately about who “started” the half hair trend, but well before it got a huge revival in 2010, Salt ‘N Pepa were credited for popularizing the hairstyle in the ‘80s. Pepa (pictured) revealed on Chris Rock’s 2009 documentary Good Hair that the style was an accident: the signature asymmetrical hairstyle came after a relaxer burned off the hair from one side of her head. (Photo: Courtesy Next Plateau Records)

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Estelle, 2005 - The hairstyle has seen a surge in the past few years but in 2009 Estelle pointed out to WWD, “Everyone and their auntie is…doing half a head shaved. I had that hairstyle in 2005 when [Rihanna] was chilling in Barbados.” We’re not sure why everyone wants to claim to be the first to do this hairstyle! But in the same interview Estelle did note that Pepa was a style influence. (Photo: Jo Hale/Getty Images)

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Kelis, 2006 - In 2009, Kelis told Honey magazine it was she who started the hair trend. ”Well, I was definitely the first to do it. The only other person I would give credit before me is Pepa. Other than that, I expect them to copy me. What else are they supposed to do? They’re young. God bless them.” The verdict’s out, but the singer did look extra Bossy in 2006 when she swapped out big curly hair for the edgy style. (Photo: Evens Lamour /Landov)

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Jack Davey, 2007 - The frontwoman of the duo-group J*Davey has long rocked a version of the hairstyle with flowing locks giving it a Mohawk feel.   (Photo by Kevin Winter/Getty Images)

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Fantasia, 2008 - Fantasia helped her cut stand out from the pack by dying the shaved part blonde and contrasting with dark black hair on the other side at the 2008 Grammy Awards. (Photo: Frazer Harrison/Getty Images)

Photo By Photo: Frazer Harrison/Getty Images

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Eve, 2008 - The rapper, who kicked off her career with completely chopped off hair, held onto a bit of her past with the honey brown shag she wore to the 2008 VH1 Hip Hop Honors. (Photo: Bryan Bedder/Getty Images)

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Cassie, 2009 - Although several stars sported the hairstyle before Cassie, the Bad Boy singer seemed to kick off a revival of the trend in April 2009. When she first debuted the hairstyle, she wrote: “Sometimes in life, you need a change … Something deeper than what you thought you were capable of … Something that displays the ‘I don’t give a f—’ attitude that was always present, but never showcased … & something that will shock your mother, but make her call you a ROCK STAR.”  She hasn’t grown it out since! (Photo: Demis Maryannakis, PacificCoastNews.com)

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La La Anthony, 2009 - La La shook things up in the style when she attended the BET Awards in L.A. June 28, 2009. She added two lines into the shaved section and wore the rest of her hair in glamorous waves. (Photo: Frazer Harrison/Getty Images)

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Melanie Brown, 2010 - A simple buzz wasn’t enough for Brown! The actress went completely bald on the side and wore her longer hair in a ponytail. Her young daughters, Angel and Phoenix Chi, have also worn similar hairstyles! (Photo: David Becker/Getty Images)

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Tichina Arnold, 2010 - Arnold wore long curls swept over her shoulder and showed off a shorter side while promoting her starring role in the Off-Broadway production of Love, Loss, and What I Wore in New York. (Photo: PNP/WENN.com)

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Laurieann Gibson, 2010 - Gibson “Boom Boom Kack”-ed onto the bandwagon but added her own spin to the look by adding a color boost. At the 2010 MTV Video Music Awards she dyed the shaved section purple and added color extensions. (Photo: Frank Micelotta/PictureGroup)

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Kelly Rowland, 2010 - Ms. Kelly also worked the trend, adding blonde and brown streaks to her long and short look while sitting front row at BCBG Max Azria’s Spring 2011 fashion show in New York. (Photo: Jason Kempin/Getty Images)

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Rihanna, 2010 - Rihanna has done several variations of shaved sides. At a Grammy’s event in 2010 the pop star kept her shaved roots black and fashioned her short blonde hair into a spiky style. (Photo: Jason Merritt/Getty Images)

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Toni Braxton, 2010 - The sultry singer kept it chic with a swooped bob that featured one line etched into the shaved section at the 41st NAACP Awards February, 26, 2010, in Los Angeles. (Photo: Frederick M. Brown/Getty Images)

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Dirty Money, 2011 - Kaleena Harper and Dawn Richard worked the trend double time while on tour with Diddy as part of the group Dirty Money in 2011. Kaleena curled her 'do into a Mohawk style while Dawn wore bangs and gathered it into the bun exposing her shorter sides. (Photo: FilmMagic)

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Raven-Symone, 2010 - Raven-Symone rocked the mic with a smaller shaved section with two lines shaved into her long locks. (Photo: Courtesy Myspace)

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Willow Smith, 2010 - The young singer exploded onto the scene with a half head of hair to whip back and forth, which drew her comparisons to Rihanna.   (Photo: Ian Wilson/WENN.com)

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Keyshia Cole, 2011 - The singer took her love for the trend to a whole new level cutting out hearts into the side of her head and dying them different shades of pink! She wore the long section of her hair into a high ponytail. (Photo: Monica Morgan/WireImage)

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Jada Pinkett Smith, 2012 - Like mother, like daughter! Jada rocked a variation of Willow’s debut hairstyle at this year's Nickelodeon Awards (March 30, 2012). Although by then Willow had already moved on to a fully shaved head dyed pink! (Photo: REUTERS/Fred Prouser/LANDOV)