The social network spat began when R&B star Rihanna took to her Twitter page to express being "hurt" by comments made by fellow singer Ciara on the E! News show "Fashion Police."

Ciara spoke on the show of an encounter with Rihanna: "I ran into her recently at a party and she wasn't the nicest, and it's crazy because I've always loved and respected what she's done with fashion and I've ran into her, you know, before but this time it was really… it wasn't the most pleasant run in…"

Rihanna retaliated by tweeting: "My bad ci, did I 4get to tip u? #howrudeofme." Ciara tweeted back: "Trust me Rihanna u don’t want to see me on or off the stage." To this, Rihanna responded with: "U gangsta huh? Haaa. Good luck with booking that stage u speak of."

The feud quickly ended though when Rihanna sent an apology tweet: "Ciara baby, I love you girl! U hurt my feelings real bad on TV! I'm heartbroken! That's y I retaliated this way! So sorry! #letsmakeup."

Ciara then accepted the apology, tweeting: "Rhi, u know its always been love since day 1! Doing shows/everything. You threw me off in that party! Apology accepted. Let’s chat in person."

What does this say about Haim Levine [Chuck Lorre] after he tried to use his words to judge and attempt to degrade me. I gracefully ignored this folly for 177 shows ... I fire back once and this contaminated little maggot can't handle my power and can't handle the truth. I wish him nothing but pain in his silly travels especially if they wind up in my octagon. Clearly I have defeated this earthworm with my words -- imagine what I would have done with my fire breathing fists. I urge all my beautiful and loyal fans who embraced this show for almost a decade to walk with me side-by-side as we march up the steps of justice to right this unconscionable wrong.

Remember these are my people ... not yours...we will continue on together...

Charlie Sheen

CBS and Warner Bros. say, "Based on the totality of Charlie Sheen's statements, conduct and condition, CBS and Warner Bros. Television have decided to discontinue production of 'Two and a Half Men' for the remainder of the season."

The decision comes several hours after TMZ posted a story in which Charlie Sheen challenged creator Chuck Lorre to a fight, calling him "a stupid, stupid little man and a pu**y punk that I never want to be like."

Sources connected with the production tell us ... Charlie's comments to TMZ were the final straw.

No word on whether production will resume next season.

J. Lo has a big breakdown while telling Chris Medina he's cut:

Yes I also believe it's ridiculous that this is newsworthy but let's be honest...you wanna see the pics too!