is at it again -- showing serious skin .... and not giving a f*** about what you think!

The "Diamonds" singer flaunts her famous figure and smoking habits in a series of just-released outtakes by Terry Richardson for Rolling Stone.

We've got to say, she looks good!

Sporting just a white one-piece (bra-less), the Barbadian beauty poses in a series of sexy positions while blowing smoke out her mouth -- like the badass she thinks she is -- and in other shots, taking a more serious demeanor.

In the latest issue of Rolling Stone, Rihanna confesses about rekindling her love affair with Chris Brown who infamously assaulted her at a pre-Grammy party back in 2009.

"After being tormented for so many years, being angry and dark, I'd rather just live my truth and take the backlash. I can handle it," she tells the mag about getting back together with Brown.

She's definitely no role model ... but at least she's nice to look at. Click "Launch Gallery" above to see all of her sexy outtakes!

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