Rihanna has taken her risqué fashion tour de force to France for Paris Fashion Week. From nipple piercing and sheer minidresses to belly-baring corsets, the 21-year-old singer is definitely breaking style boundaries.

And just when we thought we'd seen it all from RiRi, she arrived at Vivienne Westwood's Spring 2010 sans pants!

The Barbadian beauty rocked a black tuxedo jacket with a matching bra, hot pants and suede over-the-knee boots.

If we had legs like that, of course we'd show them off, too! But has she gone too far?

Weigh in on Rihanna and other questionable celeb style in our gallery below.

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Snap Judgment
Fashionable or faux pas? Weigh in on Rihanna and other celebs who pushed the envelope.
Eliot Press, Bauer-Griffin

Snap Judgment

    Paris, France, October 2, 2009
    Rihanna turns heads as she arrives at Vivienne Westwood's Spring 2010 runway show wearing short shorts and over-the-knee suede boots.

    Eliot Press, Bauer-Griffin

    New York, September 25, 2009
    Secretary of State Hillary Clinton shakes things up at the U.N with a bright orange patterned coat.

    Stan Honda, AFP/Getty Images

    West Hollywood, CA, September 23, 2009
    Ashlee Simpson-Wentz attends Carol Malony's "Paris in LA" event at Coco de Mer. Looks like Ash took the sexy theme seriously--her high-waisted shorts and bra top wouldn't pass as adequate clothing anywhere else.

    Chris Weeks, WireImage

    Singapore, September 26, 2009
    Beyonce pays a visit to the Formula One racing festivities in Singapore. She wears gold glasses, short shorts, high heels, and a low-cut top adorned with pieces of racing flair.

    Dita Alangkara, AP

    Los Angeles, September 23, 2009
    There's no doubt that Nicolette Sheridan is in inspirational shape, but why is she dressed like she just got off a horse when she has car keys in her hand?

    Marcos Vasquez, BuzzFoto/FilmMagic.com

    New York, September 22, 2009
    Rihanna takes a walk in funky thigh-high boots (a trend we're seeing a lot of lately), a spider ring (is it Halloween already?) and newly streaked hair.

    X17online.com

    Los Angeles, September 21, 2009
    At the premiere of "The Invention of Lying," Jennifer Garner wore this simple strapless floral dress by Gucci on the red carpet.

    Jason Merritt, Getty Images

    Melbourne, September 17, 2009
    At the "Screen Worlds" exhibit opening in Australia, Cate Blanchett wore a colorful one-shoulder dress.

    Scott Barbour, Getty Images

    New York, September 16, 2009
    "Gossip Girl" star Leighton Meester showcases her laidback look at the 3.1 Philip Lim show. The actress appears a little puffy and tired-looking--too many after-parties the night before, perhaps?

    JustinCampbell, BuzzFoto/FilmMagic

    New York, September 8, 2009
    "Gossip Girl" star Taylor Momsen attends a party in NYC hosted by GQ and Dior Homme for designer Kris van Assche. Her outfit consists of a tube top/high-waited skirt combo and black booties.

    Michael Loccisano, Getty Images for GQ Magazine