Rihanna, Chris Brown Beef: Karrueche Tran Stole Back Chris When Rihanna 'Needed Him' The Most? Singer Slams Chris On Instagram [PHOTO]

International Pop star Rihanna slams her ex-boyfriend in latest Instagram post.

After Chris Brown denied being in a relationship with Rihanna and Karrueche Tran telling Hollywoodlife, "[Fans have] seen me on and off again with different girls, you know who they are, but right now, as a 24-year-old man, I just choose to be single!" He added, "I'm still good friends with them," Chris said referring to Tran and Rihanna.

The singer decided to stay away from the girl drama and put more attention on his work, "[Now] it's just me being focused with my music and doing this stuff. Right now, I'm in my prime."

Rihanna doesn't buy his friendship line as posting an Instagram message saying, "I hate when ex's say... 'I'm here is you need me.' Where the F**k were you when we were together and I needed you?"

The singer may be going trough some emotional stuff after her tearful performance in Paris during her "Diamonds" song. The singer thanked the crowd for such an amazing tour as her world tour comes to a close.

The singer told the crowd, "I can't believe this s**t. You all make me so happy," said Rihanna. "This is everything that matters to me. And to stand here and feel the love in this room."

Rihanna added, "I don't know why the f**k I'm crying. That's crazy. Thank you so much. I love you guys."

Is the singer still bitter about their second break up?