Karrueche Tran and Rihanna still vying for Chris Brown's attention... is a Twitter feud on the way?

Pop songstress Rihanna is known for posting rather controversial images on her popular Twitter and Instagram accounts (usually involving semi-nude pics of herself smoking marijuana). Just days after photos surfaced online of a scantily-clad RiRi walking the streets of L.A. in a sheer black dress that clearly revealed her breasts and thong, "frenemy" Karrueche Tran tweeted the simple message, "Preserve your sexy." Was this innocent tweet really a cryptic jab at the sexy "Diamonds" songstress (who is allegedly currently dating Tran's ex-beau, Chris Brown)? Some gossip reports assume that Tran is indirectly warning Rihanna to "stop taking her clothes off" just to gain Brown's attention (although Tran is guilty of basically doing the same exact thing).

Check out some of the sexy photos RiRi enjoys sharing with fans on popular social networking sites:

And here is Rihanna's (intentional) wardrobe malfunction while out clubbing late last week:

Rumors have it that RiRi enjoys sending these steamy pics to on-and-off again beau Chris Brown to keep him on his toes. And maybe ex-flame Karrueche Tran isn't the biggest fan of that... the model tweeted on Jan. 26:

@karrueche: "Preserve your sexy."

This suggestive tweet comes just a few nights after Tran hosted a party at L.A.'s club Playhouse in celebration of her sexy appearance on the latest cover issue of Rolling Out magazine. Brown was present for the festivities, and apparently RiRi showed up to "crash" the VIP section at some point during the evening. But from the looks of it, Tran isn't afraid to show some provocative skin of her own... check it out:

There's still no proof that Tran directly meant to warn Rihanna to "preserve your sexy," but still...

So what's the deal? Is Tran still jealous that Brown is apparently more interested in Rihanna... and will RiRi respond with a cryptic tweet of her own?

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