Rihanna Diamond Grill PHOTO: RiRi Flashes Shiny, Sexy Smile on Instagram, 'I'm an Outlaw B*tch!' More Bada$$ than Justin Bieber and Miley Cyrus Grillz? [POLL]

Rihanna never ceases to amaze fans with her wild, crazy antics. The "Stay" songstress recently posted some major bling on Instagram... including a flashy Diamond grill! RiRi captioned the shiny smile with, "I'm an outlaw b*tch!" Rihanna's just the latest celeb to flaunt such bada$$ style... does she pull the look off better than Justin Bieber and Miley Cyrus? Fans decide!

On Sunday evening (July 14), RiRi posted on Instagram:

badgalriri: "I'm an outlaw b#tch!!"

She followed up the bling-y photo with:

badgalriri: "#CoCo #vintage #rare."

badgalriri: "@lynn_ban I wanna be like you when I grow up!! #BOSSY #fly #jewelrycollectionoflife thank you so much for phuckin wit ya girl, and for always opening your doors to us! #exclusive #nobasiczone."    

badgalriri: "Fuck wit me, you know I got it!! Hello #Manchester DW."  

RiRi's lookin' hot!

Justin Bieber also debuted an over-the-top gold grill at a recent fan meet-and-greet:

Wonder if Selena Gomez is a fan?

And who can forget Miley Cyrus' (less obvious) grillz swag?

Which songster looks the hottest?