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Tupac's biopic is in mortal danger ... because of a feud between a rapper and a publishing giant.

Rapper Daz Dillinger claims he holds the rights to the track "Ambitionz Az a Ridah" ... prominently featured in the "All Eyez on Me" movie. But Daz claims BMG publishing house begs to differ, insisting only it can green light the song for the flick. Thus, there's now a standoff.

The movie release has been pushed from September to November ... we're told so Daz and BMG can resolve the conflict.

This is the latest in a series of nasty legal battles between Daz and BMG. The rapper sued BMG back in April, claiming the company owes him more than $75k in royalties.

For it's part ... BMG says Daz's beef is really with eOne, the music licensing company that controls rights on the song. BMG says it merely collects royalties on eOne's behalf.

The stars of The Heidi and Frank Show on KLOS radio showed surprising sympathy for Playboy Playmate Dani Mathers -- who has a regular gig on their show -- but both acknowledge she royally screwed up by taking a pic of a nude woman in a gym shower.

Mathers has not only been blasted by pretty much everyone, she's now under criminal investigation for taking the pic and then body shaming the unwitting subject.

Heidi and Frank, who were leaving Hennessy's Tavern in Hermosa Beach Friday, both seemed more sad than angry.

Mathers has been indefinitely suspended from the station.

Drew Barrymore is officially calling it quits on her marriage to Will Kopelman ... filing for divorce after 4 years of marriage.

Drew filed Friday in Manhattan according to the NY Daily News. The divorce is uncontested, meaning it should be pretty amicable, absent any squabbles over money or their 2 daughters -- ages 2 and 3.

The couple said back in April they were separating.

Dont' let Charlie Day's frowny face make your day less sunny ... put your spottin' skills to the test and see if you can find the differences between these two pouty pics.

Jamie Foxx busted a move to classic Prince in Bev Hills Friday night ... clearly with a singular focus.

Bad week for Taylor Swift, for sure. And Game is emerging as a real leader in the racial equality movement. So we gotta ask ...

Eric Clapton's personal guitar is heading to auction and is expected to raise a ton of cash for a fellow musician.

Eric's 2014 Fender Stratocaster -- the one he played at his 70th Birthday Celebration Concert -- is being hawked by Johnny Nicholas, of classic country group Asleep at the Wheel, through Heritage Auctions. We're told it's estimated to go for more than $20,000!

The guitar's sale was intended to benefit Johnny's wife, Brenda -- who had been fighting Leukemia -- but, sadly, she passed away a few weeks ago. All proceeds will now go toward Leukemia research.

The Strat is signed by Slowhand, and you can put in an online bid now or get to Dallas for the live auction on July 23.

Mark Hunt is FURIOUS over Brock Lesnar's potential failed drug test ... DEMANDING half of B.L.'s UFC 200 winnings ... or he's bolting the UFC.

Hunt laid it all out on his website Friday night ... saying, "I've told Dana I want half of Brock's purse."

FYI -- Lesnar reportedly made $2.5 MILLION ... plus a percentage of the massive pay-per-view take.

"This is the third time I've had to fight a cheater in my career. The other two times I didn't ask for compensation, but this is the third time and I'm sick of them getting away with cheating."

If he doesn't get Brock's cash, Hunt says he wants out of his UFC deal. "I've told Dana that I want a release from the UFC if they don't sort this out."

The UFC has not yet responded to Hunt's ultimatum.

Christopher Darden said something pretty shocking ... it has to do with O.J., former LAPD Detective Mark Fuhrman, and the knife used to kill Ron and Nicole.

Darden appeared on the "Reasonable Doubt" podcast, featuring Adam Carolla and Mark Geragos. Darden joked -- we're guessing it's a joke -- that he wished the detective whose use of the n-word torpedoed the case would have bumped into Simpson sometime around 10 PM on June 12, 1994.

January Gessert, best known for allegedly being "the other woman" who triggered Kim Kardashian's breakup with Reggie Bush, is getting a shot at another 15 minutes.

Ab Crack (ab-/krak/) noun 1. A fitness fad -- mainly found on models -- consisting of a crease that runs down the center of a fit stomach.

Rihanna was in the middle of dinner at a restaurant in Nice when she learned 84 people were slaughtered just 20 minutes away.

We got these pics of the singer, whose scheduled concert Friday night was cancelled out of respect and security concerns.

Dani Mathers is now in the crosshairs of cops, because TMZ has learned there's now a criminal investigation over the pic she took in a gym locker room.

We found out the brass over at LA Fitness went to cops Friday and filed the report, accusing the former Playboy Playmate of egregiously violating a member's right of privacy by taking a pic of her while naked in the shower, and then humiliating her by posting the pic with a disgusting caption.

We're told the police investigation is based on a criminal law prohibiting the dissemination of private images.

The woman in the pic has not come forward ... the report lists "Jane Doe" as the victim.

Dani has already been punished ... we've learned Playboy has suspended her from all Playmate activities including her show on Playboy Radio.

On the criminal front Dani could get a big break ... if the victim never comes forward the case might well be dropped.

Nooooooooooooo!!!!!

The UFC announced Brock Lesnar has been flagged by the U.S. Anti-Doping Agency for a potential violation stemming from a pre-UFC 200 test.

Model Chantel Jeffries hung a rainbow over South Beach ... and we're betting more than a few leprechauns were chasing it too.

Justin Bieber's ex-gf/travel pal is still leading a very colorful life -- even without the pop star.