Rihanna, Chris Brown Twitter Diss a 'Moment of Weakness': RiRi Regrets Bashing Karrueche Tran's Beau for New Album 'X' Collaboration Shout-Out, 'Not in Right Mind'

On July 4, "Fine China" crooner Chris Brown tweeted a shout-out to several artists that'll appear on his upcoming album "X" - including ex-girlfriend, Rihanna. And the "Diamonds" songstress didn't take it as a compliment. Instead, she deemed Karrueche Tran's current beau a little "b#tch." The Twitter diss soon went viral... but now it appears that RiRi regrets here rash (and rather harsh) cyber actions. Insiders insist that RiRi simply let her guard down during a moment of weakness... and she didn't mean it. Do fans believe that's the truth?

Breezy posted this "X" shout-out on Twitter last week:

@chrisbrown: "New album features @NICKIMINAJ ,Kendrick , @rihanna, @KELLYROWLAND , @wizkhalifa ,@bobatl and more surprises to come. 'X.'"

And RiRi's reaction?

@rihanna: "Phuck O.utta H.ere B.#tch!!!"

Dang.

Apparently Rihanna's still pretty hostile over Chrianna's recent break up.

But according to Hollywood Life insiders, RiRi really didn't "mean it." In fact, several of the songstress' good friends were shocked by such brash behavior. The Barbadian beauty "wasn't in her right mind" and just had a slight "moment of weakness" which she now regrets.

If that's true, why hasn't RiRi deleted the offensive posts on Twitter AND Instagram...

Meanwhile, Breezy isn' about to get into it with his former flame. He'd rather focus on his rekindled relationship with Tran. 

"What's the point," another source said. "That's his ex girl, he's not about to go in on her like that in public. He's just going to go about his day like it didn't happen." 

Will the drama ever end?