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9:45 AM PT -- Big Sean just weighed in again, and tells TMZ ... someone, other than Bieber, pulled a fast one on him.

Justin Bieber got a little handsy with Ariana Grande during a performance Wednesday night ... much to the dismay of her boyfriend Big Sean, who went on Twitter and threatened him.

Bieber made a surprise appearance at Grande's concert at the Forum in L.A. Wednesday, where the two performed "As Long As You Love Me." Toward the end of the song, Justin calls her over, tells her to stand in front of him ... and throws his arms around her.

It's pretty apparent ... Ariana's not having it and she quickly disentangles.

But apparently not quick enough for Big Sean, who was in Canada -- and caught wind of Bieber's antics through social media. He tweeted (and later deleted), "This kid is about to learn not to touch my girl like that. Beliebe that."

Chad Johnson just proved he's the best Twitter pal in the history of the freakin' world ... 'cause the former Pro Bowler just forked over $1,000 to one of his followers ... so she could have a good b-day.

We spoke to Heather Torregano -- @DaRealNette on Twitter -- and she tells TMZ Sports this all started when she tweeted a link to a GoFundMe account she started to try to raise some money for b-day plans.

"I work as a waitress and a bartender, plus I pay out of my pocket to go to school. I was just trying to have a good birthday, I haven't had one in a long time."

She said she was as surprised as anyone when she checked the account and saw a PHAT $1,000 donation from Johnson who she says has been following her on Twitter for a couple of years.

Torregano says ... when she saw Johnson accounted for nearly HALF of her goal of $1,600 in one fell swoop, she was overcome with emotion.

"I cried, honestly. I was expecting people to give maybe like $20 or $50 ... but a full $1,000? There is no way I could have expected that."

Mo'ne Davis continues to show why she's the most mature 13-year-old alive -- we've just learned she reached out to the president of Bloomsburg University and asked him to reinstate the baseball player who called her a bad name on Twitter.

TMZ Sports spoke with a rep for Bloomsburg who tells us ... President David L. Soltz received an email from Davis and her coach in which they ask that Joey Casselberry's dismissal from the team be reconsidered.

Casselberry was booted from the squad this weekend after he posted a tweet saying, "Disney is making a movie about Mo'ne Davis? WHAT A JOKE. That s*** got rocked by Nevada."

The team said Casselberry violated the athletic department's social media policy -- and possibly the school's code of conduct.

While Bloomsburg says they respect Davis' opinion and praise her for being incredibly mature about the situation -- the school will NOT reinstate the baseball player ... saying, "Right now we're standing firm."

For his part, Casselberry apologized for the tweet and says he's a huge Mo'ne Davis fan.

After we broke the story, Mo'ne spoke with ESPN and explained her decision -- saying, "I know right now he's really hurt ... everyone deserves a second chance."

Miley Cyrus may be pissed off at Patrick Schwarzenegger ... but she's gotta do something to shield him from the death threats he's receiving from her rabid fans.

Patrick's assurances he'd never cheat on his lady have fallen on deaf ears, because Miley's legions are sending thousands of hate tweets threatening to kill him and burn down his pizza shop.

One fan warned, "you better run for your life when you come to LA" and "I hope your pizza place burns down." Another wondered, "Who's gonna kill Patrick for us?"

Others threatened all-out war "... be ready for what's about to come," punctuating the threat with a knife and poo emojis.

Of course, he couldn't escape without an Arnold reference ... "You and your dad have a way of f***ing good s*** up."

Yikes.

If "Empire" really did rip off one of its characters from real-life NBA star Iman Shumpert -- you can't blame Terrence Howard ... 'cause Terrence says he's honestly never even heard of the guy.

As we previously reported, Iman suggested that producers based the characters of Hakeem and Tiana after him and his GF Teyana Taylor ... and pointed to their hairstyles as evidence.

But if that's true ... it's definitely news to the star of the show, Terrence Howard ... who told us he doesn't know Iman and he doesn't watch basketball.

That's ok ... Iman says he doesn't watch "Empire" either.

Kathy Griffin has thrown in the towel, quitting "Fashion Police" because she thinks it's too mean-spirited.

Griffin just tweeted a treatise, saying, "I thought I could bring my brand of humor to Fashion Police so that beautiful people in beautiful dresses could be teased when appropriate." Griffin adds, "My brand of humor, while unrepentant and unafraid, is all about CONTEXT. There's plenty to make fun of in pop culture without bringing people's bodies into it."

Griffin was not specific on what changed her tune, but she did say, "I do not want to use my comedy to contribute to a culture of unattainable perfectionism and intolerance towards difference."

She never mentioned the whole thing with Zendaya at the Oscars, but she did mention in her tweet being a champion of people of color.

Lindsay Lohan is about to learn a life lesson ... nothing on the Internet is ever really gone ... because her attempt to delete the N-word from social media has failed miserably.

Lohan went to see Kanye West perform Tuesday night as part of Paris Fashion Week. She posted a photo of Kanye onstage that included the caption, "#kanye&kimAlldaynigga$."

Lindsay deleted the corresponding tweet and edited the Instagram post to remove the N-word ... but her followers noticed and called her out on it, writing things like:

-- "Why did you change what you wrote?"
-- "You said the N word?!? Wow I seen your original post and so did thousands others"
-- "She deleted N word so fast ..... Wow !!"

Scott Disick continues to piss people off all over the U.K. -- this time by bailing on two club appearances at the very last minute ... and the clubs only found out by checking Twitter.

Disick was supposed to appear at Southampton's Switch night club and Bournemouth’s Cameo club, but instead jetted off to Paris to hang at Fashion Week with Kim Kardashian, Kanye West, Kris Jenner and Kendall Jenner.

Switch night club blasted him, saying ... "Scott Disick has let us know via his manager's Twitter at 9.30pm that he cannot come tonight due to 'unforeseen circumstances.' The real truth is he's gone to Paris to party and ignore his fans."

Switch continued, "These famous for nothing celebs have too much money and don't realise [sic] they are letting down venues, ruining peoples reputations and livelihood, and their fans."

Disick has two more club appearances scheduled in the U.K. for Friday night -- and both clubs say Disick's people have assured them he'll be back from Paris in time.

Disick is already in hot water for his behavior at an appearance earlier this week. The organizers plan to sue him, claiming his poor attitude and general disinterest cost them a lot of money.

Karrueche Tran slept on it, and she's decided -- Chris Brown and his baby are not going to be part of her life because she can't take any more drama.

Chris' now ex-GF just reacted to the story TMZ broke -- that Chris has a 9-month-old baby girl -- tweeting, "Listen. One can only take so much. The best of luck to Chris and his family."

As we reported ... the baby's mother is a 31-year-old woman named Nia ... who's been friends with Chris for several years.

Karrueche ended her tweet with a very definitive ... "No baby drama for me."

BTW -- props to KT for the brown baby emoji.

The company behind #TheDress has put the debate to bed -- it's blue and black -- and the hubbub has done wonders for its business ... thanks to the hashtag hysteria.

#TheDress phenomenon began after a woman posted a photo of her mother's dress for her wedding ... asking people to ID the color. From there ... EXPLOSION ... with the likes of Justin Bieber (blue and black), Kim Kardashian (white and gold), and Taylor Swift (blue and black) all weighing in.

A rep for the company that makes the dress, Roman Originals, tells TMZ the dress is blue and black, but it also comes in pink and black, white and black and red and black. There isn't a white and gold option yet ... but Roman is looking to add it to the line because of all the commotion.

As for business, Roman Originals says sales are up 347%.

And here you thought a few escaped llamas would be the weirdest thing to happen on the Internet this week.

Dez Bryant says he's been betrayed ... but he's not saying by whom ... or how.

In the wake of rumblings that a tape exists showing Bryant doing something terrible ... a tape everyone's talking about but no one says they've seen ... Bryant went to Twitter to express his frustration.

"I need to get me a real raw uncut tv show or something ... I can't continue to get betrayed like this."

It's the second time Bryant has addressed the rumors.

Last week, he posted another cryptic statement that reads ... "Just quit with the b.s. … It’s clear as day what's going on… I might need to do a exclusive interview about my life these past 5 years since the world is destined to know."

"I use to let people take advantage of my life now that I’m no longer allowing that to happen it seems to be a problem… I’m not ashamed of none of my past incidents because that’s what made me who I am today."

Kelly Osbourne just dropped an ultimatum on Giuliana Rancic and their "Fashion Police" bosses -- issue a mea culpa for saying Zendaya smells like a hippie pot smoker ... or she'll quit the show.

Kelly is responding to the firestorm Giuliana sparked with a comment about the Disney star's Oscar look -- which included new dreadlocks. Rancic said she thought Zendaya must smell like patchouli oil or weed. Kathy Griffin joined in on the "weed" comment.

Kelly went off on a Twitter rant, saying ... "I'm giving everyone involved 24 hours to make it right or the world will hear how I really feel." She added she doesn't condone racism and is seriously questioning staying on the show.

Osbourne reminded fans she's friends with Zendaya -- who herself blasted Rancic for making such an "outrageously offensive" stereotypical comment.

It sounds like no one involved is buying Giuliana's claim her remarks "had NOTHING to do with race."

4:30 PM PT-- Looks like Kelly has pull ... Giuliana just apologized again -- this time on the air during "E! News."

Amber Rose just answered Kayne West by zeroing in on the climactic scene in Kim Kardashian's sex tape, saying "Wait 30 Showers? But Kim let RayJnut on her .... Never Mind."

In case you're not up to date ... Kanye went on "The Breakfast Club" and said it was hard for him to move on to Kim after being with Amber, saying, "I had to take 30 showers before I got with Kim."

Amber is not backing down. She's already called Kim a whore and Kanye is doing Kim's bidding.

Amber went on to say, "[A]fter all these years I never snitched on u and I don't plan on starting now. We once loved each other so I won't do u like that."

She concluded by saying, "I'll leave that up to the Kartrashians to humiliate u when they're done with u."

Amber Rose and Khloe Kardashian can shut down their Twitter beef -- because Tyga is not sleeping with 17-year-old Kylie Jenner ... according to Tyga.

Tyga hit up "The Breakfast Club" -- the same radio show where Amber blasted Kylie -- to clear up the rumors he's banging the youngest Jenner sis. He explained, "No, I'm not dating Kylie. I wanna be clear to everybody, I didn't leave my family to be with Kylie. That's ridiculous."

Responding to a report someone called child services -- Tyga claims law enforcement has NOT reached out to him about the possibility he has committed statutory rape. He added ... although he hangs out with Kylie, Kendall is usually there too. Although ... we've seen them out alone on multiple occasions.

Tyga also talked about his feud with Drake, and took a stand on the Lil Wayne/Birdman war … claiming he hasn't received a single dollar in royalties from Cash Money.

More beef than a butcher shop.

Amber Rose won't stop until she's at war with ALL of the Kardashian-Jenner sisters -- she just yanked Kim Kardashian into what started out as a jab at Kylie Jenner ... by calling her a "whore."

Amber started the shade-slinging by going on a radio show and ripping Tyga for dating 17-year-old Kylie Jenner. The back story, of course, is Tyga's ex Blac Chyna is Amber's BFF. Then Khloe Kardashian stood up for her kid sis with a tweet reminding everyone Amber's admitted she was a "stripper since I was 15 years old.”

Now ... Amber's fired back with a gem of a meme -- a pic of Kanye West with the text ... "When ur sister in law calls out ur ex for being a stripper ... But ur wife has a sex tape."

And that was Amber's 2nd salvo blowing up Kim -- earlier she tweeted Khloe, "I'll be that lil whore to support my family like ur older sister is a whore 2 support hers."

Even more H.S. drama -- Wiz Khalifa (Amber's ex) just started following Khloe on Twitter ... seemingly siding with her & Kylie -- while Reggie Bush (Kim's ex) is now following Amber.

All units respond. Multiple shots fired.

"The Godfather of Poker" Doyle Brunson says he no longer views Bruce Jenner as a hero ... all because of Jenner's decision to become a woman.

Brunson tweeted, "I can't believe Bruce Jenner is trying to become a woman? He was a hero of mine since I was involved in track long ago. #Sayitsnottrue"

Doyle continued, "this man was an Olympic champion that set all kind of records. That's a woman? My hero? Come on!" ... and his tweets triggered outrage in some.

The 81-year-old -- who's won the World Series of Poker twice -- eventually responded to the onslaught with a jab, writing, "He may still be some people's hero, but not me."

Brunson was inducted into the Poker Hall of Fame, he's won 10 WSOP bracelets in his career and is considered to be one of the most influential poker players of all time.