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Pauly D's a no-talent poser -- at least according to electronic music legend Deadmau5.

The famed mouse-headed DJ was shooting a music video in LA over the weekend -- when we asked if he thought the "Jersey Shore" star had any real DJ talent. Deadmau5 responded, "No, not really."

DM's Pauly D jab comes in the wake of a little Twitter feud last week -- when Mr. Mau5 publicly bashed Pauly's new music video, saying it looked embarrassingly cheap ... "like it cost about $150 to make."

It seems Rihanna has finally had enough of Chris Brown ... the singer has "unfollowed" her ex-boyfriend on Twitter after he released a new diss track that appears to be aimed at her.

The song in question is a remix of Kanye's TheraFlu -- in which Brown freestyles the verse, "Don't f*ck with my old bitches ... like a bad fur ... every industry n*gga done had her."

He continues, "Trick or treat like a pumpkin ... just to smash her."

Hours after Brown released the track last night, Rihanna stopped following Brown on Twitter -- a HUGE move -- and one that's leading many to assume Rihanna believes the verse is about her.

A short time later, Brown unfollowed Rihanna.

We reached out to Rihanna's rep -- so far, no comment.

There's a reason Rihanna's arm was hooked up to a bunch of needles and tubes yesterday -- sources close to Rihanna tell TMZ, the singer had been struck down with a bad case of the flu ... and required an IV drip.

Sources tell us, she started feeling really ill last week and saw a doctor on Thursday ... but by the time of her "Saturday Night Live" appearance, she still wasn't fully recovered.

As we first reported, Rihanna missed the SNL dress rehearsal because she was sick -- but show producers didn't buy her excuse ... insisting she didn't appear ill.

But looks might be deceiving -- because we're told Rihanna wasn't just ill during her SNL performance, she also continued to feel sick the next few days ... and her doc was forced to put her on Penicillin.

Soon after, Rihanna began to experience flu-like symptoms -- requiring IV treatment yesterday, which is when she posted the above picture on Twitter.

It's been nearly six months since we've heard a peep from Mariah Yeater, the girl who claimed to have birthed Justin Bieber's baby -- but The Biebs resurrected her yesterday via Twitter ... with a little help from Borat.

Yeater's case was tossed out of court and she's been radio silent since last November, but Bieber decided to call her out anyway.

The Biebs tweeted, "Dear mariah yeeter...we have never met...so from the heart i just wanted to say..." and then he linked to a video of Borat saying "You will never get this" over and over.

Dick Clark's only been dead a few hours ... but the roasting has already begun ... this time, it's Denis Leary leading the charge.

Leary went to his Twitter a few minutes ago and wrote, "With Dick Clark dead, Casey Kasem now reveling in his status as last and reigning king of leather faced syrup voiced lizard people."

There's more -- Denis wrote, "I'm gonna package a Dick Clark Hologram mc'ing a Tupac Hologram summer tour."

So, we gotta as ask ...

Supermodel Bar Refaeli claims she feels violated after a screening by a female airport security worker in London this morning ... saying the incident "left no doubt about her sexual preferences."

Bar -- who didn't specify which airport she was at -- just vented about the incident on Twitter ... saying, "I got a security 'patdown' by a woman at the airport that made me feel very uncomfortable and left no doubt about her sexual preferences."

It's not the first time a hot-bodied celebrity has accused airport security of crossing the line during a screening ... just last year, Cheryl Burke claimed a TSA agent got extremely hands-on around her crotch.

Twitter giveth and Twitter taketh away ... as Courtney Love apologized yesterday to her daughter (on Twitter) for comments she made about her (on Twitter). Maybe some face time is in order here.

Frances Bean was super pissed at Courtney after she claimed Dave Grohl hit on Frances ... despite the fact Frances is engaged.

Court apologized, tweeting simply, "Bean, sorry I believed the gossip.. Mommy loves you."

Parenting ... Twitter style.

Courtney Love is a delusional LIAR who should be banned from Twitter forever ... this according to her biological daughter Frances Bean Cobain.

Frances Bean has just issued a statement in response to Love's allegations that former Nirvana drummer Dave Grohl hit on Frances during a recent encounter ... and it's clear, there's still a rift in the family.

Frances Bean states, "While I'm generally silent on the affairs of my biological mother, her recent tirade has taken a gross turn. I have never been approached by Dave Grohl in more than a platonic way."

She adds, "I'm in a monogamous relationship and very happy. Twitter should ban my mother."

Grohl has also denied Love's accusations -- saying, "Unfortunately Courtney is on another hateful twitter rant. These new accusations are upsetting, offensive and absolutely untrue."

NFL bad ass Jeremy Shockey is a horrible teammate and an even worse person ... this according to a guy who would know ... former NY Giants wide receiver Amani Toomer.

Toomer -- who played with Shockey for 6 years in NY -- CRUSHED the tight end on his Twitter page this morning ... after Jeremy said he'd be open to returning to the Giants.

As our friends at ProFootballTalk.com pointed out ... Shockey left the Giants on really bad terms in 2008 ... insisting he would NEVER play for the team again.

Now, Toomer wants to make sure Shockey's kept to his word ... tweeting, "No!! Shockey ‘I will never play4 you again!’ he yelled at jerry Reese in 08. Let him keep his word. Bad teammate, worse person."

It's unclear why Toomer has so much anger towards his former teammate.

Shockey -- who played for the Carolina Panthers last season -- has yet to respond.

10:00 AM PST -- Well, Shockey responded ... tweeting, "Yes remember when [Toomer's] ex divorced him and he urinated on a her cloths [sic] I guess he’s the good person.”

Shockey is referring to Amani's divorce ... when back in 2007, Toomer's ex-wife alleged he once peed on her clothes.

Russell Brand just kinda, sorta 'fessed up to the whole iPhone snatch and toss in New Orleans ... hilariously blaming Steve Jobs for the whole thing.

Brand just tweeted, "Since Steve Jobs died I cannot bear to see anyone use an iphone irreverently, what I did was a tribute to his memory."

TMZ broke the story ... Brand was accused of ripping an iPhone out of the hands of a paparazzo in New Orleans Monday night ... and then firing the phone at an office building ... shattering a window.

Cops said they were investigating the incident. Brand has since offered to pay for the window he broke.

With his future on the Patriots in question, Chad Ochocinco is trying to do good by anyone he can -- in this case NYC -- dropping nearly $8,000 on a massive fried chicken dinner last night ... for 200 local fans.

In case you don't follow him on Twitter -- the football stud sent an open invite to anyone in the New York area ... offering a free dinner to the first 200 people to show up at the famous Sylvia's soul food restaurant in Harlem.

Needless to say, hordes of people came -- just check our video for proof -- and sources tell us, Ocho treated the hungry mob to a full array of Southern-style deliciousness ... including BBQ ribs, fried chicken, mac & cheese, and red velvet cupcakes.

Sources at the restaurant tell TMZ, Ocho spent $7,914 on grub altogether -- but they wouldn't specify how much he tipped.

Patrick Schwarzenegger was treated in an Idaho hospital after injuring himself skiing yesterday ... continuing the Schwarzenegger family tradition of sports injuries.

The 18-year-old son of Arnold Schwarzenegger and Maria Shriver tweeted a few photos after the accident, saying, "Little ski accident today. Some bruises and stiches down back and but. Thanks to sun valley doctors for everything."

The Schwarzeneggers are no strangers to sporting accidents. Christopher Schwarzenegger was in a serious surfing accident last year that landed him in the ICU for several days. The Governator himself broke his leg in Sun Valley as well back in 2006.

Davy Jones' death was a crushing blow to thousands of famous people across the Internet -- including Al Roker ... who spoke for millions when he tweeted, "A little bit of my youth just died."

Elijah Wood, Boy George, and Rosie O'Donnell also weighed in online ... check out some of the Twibutes.

Anthony Bourdain is putting Paula Deen ON BLAST -- mocking the butter-loving chef for poisoning Americans with unhealthy food ... and now trying to profit off of their illness.

In an ultra-transparent Twitter attack -- Bourdain wrote, "Thinking of getting into the leg-breaking business, so I can profitably sell crutches later."

The "Kitchen Confidential" author is presumably pissed that Deen -- who built an empire off her high-fat, high-sugar recipes -- announced she has diabetes ... and subsequently revealed she's become a paid spokeswoman for a diabetes medication.

There are reports ... Deen knew about her diabetes for years -- but continued to hock her recipes on her Food Network cooking show, while secretly negotiating the endorsement deal.

Obviously, Bourdain sees a serious conflict of interest in Deen's behavior.

Khloe Kardashian is lashing out at her former step-mothers -- claiming the women should be "ashamed" for telling a tabloid magazine that Robert Kardashian isn't her biological father.

Khloe's fury is directed at Jan Ashley and Ellen Kardashian -- who were each married to Robert after he split from Kris Jenner. Both recently claimed Robert privately revealed to them that Khloe was fathered by another man.

Now, Khloe is firing back on Twitter ... saying, "The audacity you have to mention my father’s name like this! Should be ashamed of urself! I let a lot of things slide but this one is really low… YOU ARE DISGUSTING! (yes you know who YOU are)."

Bill Maher is at it again ... poking fun at Tim Tebow on Twitter just a week after he took some serious heat for mocking the Broncos QB on Christmas Eve.

Maher took a not-subtle-jab at Tim following his terrible performance in a blowout loss to the Bills (see below) which ticked off both Tebow fans and the religious right.

The "Real Time" host took to his Twitter again yesterday to post two pics of him Tebowing in Hawaii -- one of which he calls Treebowing since, as you can clearly see, he's up in a tree.

New rule ... every one needs to lighten up just a little.