Walk into our offices any day and you will most likely hear us discussing Nicki Minaj's latest outrageous getup. Rihanna, Katy Perry and Lady Gaga also subscribe to the pop star's style ethos: They are constantly pushing the envelope with wacky looks that go from trendy to tragic (sometimes in the same week). Whether they're on stage, or just galavanting around, these celebrities certainly have us looking twice.

We've caught ourselves using the term "edgy" a bit too broadly lately, though. Recently, we described a starlet's blue sunglasses as edgy. A thong in public is daring, but colorful eyewear? Not so much.

So what does edgy even mean these days? In the past, the term was just that: On the edge of what was socially acceptable. Some of the earliest examples of celebrities that were truly ahead of their time are The Beatles with their moptop hairstyles, David Bowie in full makeup as Ziggy Stardust, Grace Jones' cross-dressing looks (in collaboration with famed lensman Jean-Paul Goude), Cher's bikini-wax-defying looks and Courtney Love in ripped babydoll dresses as the front woman for Hole. And of course, Madonna will always top our list of celebrities whose chameleon-like style keeps us guessing.

While those celebrities get gold stars in our books for bucking tradition, we really tip our hats to the brave women of the 1920s who tossed aside traditional notions of feminine style (think "Downton Abbey's" high-necked, floor-length dresses) for shorter, swingy dresses that allowed them the freedom of movement to let loose on the dance floor. Turning social mores on their head is how we define edgy, so while we appreciate the entertainment value of Nicki Minaj's purple hair and Katy Perry's oscillating bras, we will save the term 'edgy' for stars whose influence on pop culture is undeniable.

Check out our roundup of 45 stars who are doing their best to become style legends.

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  • The Beatles At The 'Sergeant Pepper's Press Launch May 1967

    (Photo Credit: Hulton Archive)

  • Barbra Streisand At The 1969 Academy Awards

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  • David Bowie During His 'Ziggy Stardust' Era In 1973

    (Photo Credit: Michael Ochs Archives)

  • Grace Jones In 1979

    (Photo Credit: Time & Life Pictures)

  • Prince At The Ritz Club 1981

    (Photo Credit: Redferns)

  • Madonna At The 1984 MTV Video Music Awards

    (Photo Credit: Getty Images)

  • Cher in Bob Mackie At The 1986 Academy Awards

    (Photo Credit: Getty Images)

  • Cher in Bob Mackie At The 1988 Academy Awards

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  • Demi Moore At The 1989 Academy Awards

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  • Courtney Love In The 90s

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  • Kim Basinger At The 1990 Academy Awards

    (Photo Credit: Getty Images)

  • Whoopi Goldberg At The 1993 Academy Awards

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  • Elizabeth Hurley in Versace At The 1994 "Four Weddings and a Funeral" London Film Premiere

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  • Lizzy Gardiner At The 1995 Academy Awards

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  • Sharon Stone At The 1998 Academy Awards

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  • Rose McGowan At The 1998 MTV VMAs

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  • Lil' Kim At The 1999 MTV Video Music Awards

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  • Angelina Jolie in Versace At The 2000 Academy Awards

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  • Jennifer Lopez In Versace At The 2000 Grammy Awards

    February 2000 (Photo Credit: Getty Images)

  • Britney Spears At The 2000 MTV VMAs

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  • Britney Spears At The 2001 MTV Video Music Awards

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  • Bjork in Marjan Pejoski At The 2001 Academy Awards

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  • Christina Aguilera At The 7th Annual Blockbuster Awards

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  • Halle Berry in Elie Saab At The 2002 Academy Awards

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  • Lara Flynn Boyle At The 2003 Golden Globe Awards

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  • Janet Jackson Performs At The 2004 Superbowl

    February 2004 (Photo Credit: Getty Images)

  • Beyonce At Conde Nast's Third Annual Fashion Rocks In 2006

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  • Lady Gaga At The 2009 MTV Video Music Awards

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  • MIA in House of Holland At The 2009 Grammy Awards

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  • Lady Gaga At The 'We Are Plastic Ono Band' In October 2010

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  • Lady Gaga At The 2010 MTV Video Music Awards

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  • Ke$ha At The 2010 MTV Europe Music Awards

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  • Lady Gaga At The 2011 Grammy Awards

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  • Rihanna in Jean Paul Gaultier At The 2011 Grammy Awards

    (Photo Credit: Getty Images)

  • Nicki Minaj At The 2011 MTV Video Music Awards

    (Photo Credit: Getty Images)

  • Nicki Minaj in Versace At The 2012 Grammy Awards

    (Photo Credit: Getty Images)

  • Katy Perry At The 2012 MusiCares Person Of The Year Tribute To Paul McCartney Concert

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  • Chloe Sevigny At 'Schiaparelli and Prada: Impossible Conversations' May 2012

    (Photo Credit: Getty Images)

  • Rihanna In New York In June 2012

    (Photo Credit: WireImage)

  • Katy Perry At The Pepsi/Billboard Summer Beats Performance In Hollywood June 2012

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  • Micaela Schaefer At The Lena Hoschek Show In Germany July 2012

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  • Madonna At The MDNA Tour at Hyde Park July 2012

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  • Jennifer Lopez At The Enrique Iglesias and Jennifer Lopez Tour July 2012

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  • Rebecca Romijn At The Hollywood Bowl Presents The Producers July 2012

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  • Nicki Minaj At The Today Show, August 2012

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