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Steven Avery is renewing his fight to get outta prison and believes there's better technology to prove the cops railroaded him while investigating Teresa Halbach's murder.

Avery -- who is serving a life sentence without parole -- wants the state of Wisconsin to do radiocarbon testing to show the age of his blood that was found at the Halbach crime scene in 2005.

As he claimed in "Making a Murderer" ... Avery believes cops planted blood they'd previously drawn from him years earlier, during his rape conviction. Avery's hope is the new testing will back that up.

Ariana Grande isn't licking donuts with her new bf Mac Miller, they're getting new tattoos.

The new couple got inked Thursday at the famed tattoo parlor Shamrock Social Club on the Sunset Strip.

Ariana got the letter "A" and the Venus symbol inked on her hands, and as for Mac's tat ... it's of the horizon, but there's still some room on his neck to get her name down the line.

Mel Gibson's former girlfriend, Oksana Grigorieva, made good on their new custody settlement and moved out of his Sherman Oaks rental, and now he's dumping it.

Mel's selling the 4 bedroom, 3.5 bath pad for $2.575 million. The 3,468 square foot home hit the market Thursday. It's a Frank Lloyd Wright knock-off -- modern architecture with a bunch of stone features and stained glass. No pool though.

As we previously reported ... Mel agreed to give Oksana just under $30k in child support each month for their 6-year-old daughter, Lucia, IF Oksana agreed to move out of the rental.

Kevin Smith and Ben Affleck used to be tight -- ya might even say like Batman and Robin -- but something's changed.

We got Kevin out in NYC and, naturally, we hopped on 2 of his fave topics -- Batman and Ben. Then came the shocker about how long it's been since they bro'd down.

Check out the vid ... Kevin also dropped a few suggestions for who could be the NEXT Batman. He wasn't taking a shot at the current one.

"Narcos" star Stephanie Sigman -- the hot Colombian reporter who hooked up with Pablo Escobar -- was nowhere to be seen at the season 2 premiere ... because she was snubbed.

Production sources tell TMZ ... the show didn't mean to diss Steph ... it was more a case of out of sight, out of mind. Although her role in season 1 was pivotal, her involvement in season 2 is spotty.

For her part, we're told Stephanie was real upset when she didn't get an invite, but she stood on principle and never contacted producers ... thinking it was intentional rather than an oversight.

So Wednesday's party was awesome, but not as hot as it could have been.

Director Paul Verhoeven is proof inspiration strikes in species everywhere -- like dog nipples for the 8-breasted hooker he wanted for "Total Recall."

The famed director -- who also had a hand in classics like "RoboCop" and "Starship Troopers" -- dished LOTS of details when we caught up with him Thursday night in L.A. Check out the vid ... he's seriously fixated on boobs.

We couldn't leave without settling a huge puzzler in "Starship Troopers" -- is the big alien meant to look like a vagina?

Take a look.

Rick Ross fired a warning shot in the air for Drake ... on the heels of the renewed feud with Meek Mill.

Rick was on the "Drink Champs" podcast when N.O.R.E. and DJ EFN asked about his homie, Meek, getting destroyed by Drizzy. Rozay made it clear .. he does NOT think Meek lost a damn thing. As he put it, "We all rich!"

But after Drake's stop in Philly last weekend the beef's been heating up again and Ricky says if it continues, this time ... he'll be jumping in too.

Check out the clip ... he never SAYS anything about violence, but the insinuation is in the air -- and there's a subtle shot at Birdman's financial issues too.

Justin Bieber is one helluva a multitasker ... dancing, chowing down on a sub and getting some QT with Sofia Richie ... and he did it all in front of the TMZ Celebrity Tour bus.

Sofia and the Biebs were cruising down Sunset Blvd in WeHo Thursday during rush hour when they ended up stopped next to our bus.

We tried to get some intel on JB's sandwich of choice, but all he was giving up was his dance moves. Fans on the bus and on Sunset Blvd. seemed more than satisfied.

We all know Emily Sears can throw down burgers, thanks to Carl's Jr. ... but her ass is pretty good at devouring stuff too.

We got the Aussie smoke show in Santa Monica, taking a dip and soaking up the end of summer rays.

Emily famously sucked down a ton of bacon during that "Three-Way" spot.

Yeah, it's pretty clear she does good work with food.

Secret's out ... Demi Lovato is dating UFC superstar Luke Rockhold -- and TMZ Sports has learned it's a romance that's been blooming for a couple months.

Our sources tell us ... the 24-year-old singer hit it off with the 31-year-old former UFC middleweight champ earlier this year while training at Unbreakable gym in Los Angeles.

Long story short ... we're told the two clicked right away -- and have even sent some secret inside messages to each other on social media ... including a back and forth with smiley face art on their fingers.

Congrats!

Britney Spears seemed innocent enough when she jumped in an SUV with James Corden for a Carpool Karaoke sesh, but then she said something pretty stunning ... she's given up on marriage -- doesn't believe in it -- she's giving up on men too, but she wants 3 more kids.

Ashley Graham will be taking a hard look at the girls in this season's "America's Next Top Model" ... but she was due for a once-over herself arriving on set.

The plus-size model was seen Thursday night at Chelsea Piers for 'ANTM' filming in NYC, puffing out her chest in full confidence ... clearly ready to take on the role as a new judge for the show.

Casper Smart and Jennifer Lopez are talking again and on friendly terms ... the only difference is J Lo broke up with him and he's in denial.

Casper flew to NYC to be with Lopez, who's there for 4 months shooting her TV show, "Shades of Blue." Sources close to both of them tell TMZ, their relationship is "amicable" and they are still great friends with a lot of affection and history ... but J Lo has made it clear ... they are no longer a couple.

As for Casper, we're told he is not accepting the breakup and is in strong denial. As we reported, the last straw in the relationship was Saturday night, when Casper blew off a big fundraising event in the Hamptons -- an event where J Lo wanted Casper to accompany her -- to attend UFC 202.

Casper thinks it's just another fight, but J Lo is resolute -- the relationship is over.

Richard Branson is a disaster on 2 wheels ... and this one damn near killed him.

The billionaire adventurer's face is busted up after a horrific cycling accident on Virgin Gorda in the Caribbean. Branson says he was flying downhill shortly after sunset, and never saw a speed bump in the road.

66-year-old Branson says he was launched over his handlebars and slammed down on concrete ... face first. The Virgin honcho says he broke his cheekbone and severely bruised his shoulder. The bike went over a hillside.

He says he's lucky to be alive. Again.

Keep in mind, Branson's already survived run-ins with deadly stingrays, smashed out his teeth with a tennis racket, and walked away from multiple bad balloon landings.

Senator John McCain literally melts when he talks about his favorite female celeb ... one Britney Spears.

Our photog got the 79-year-old Republican from Arizona at LAX Thursday, and he makes it clear ... he's not just paying lip service -- he's hardcore Brit.

Kanye West found a way to rise above the crowd -- a floating stage.

'Ye kicked off his Saint Pablo Tour in Indianapolis Thursday night, hovering over the audience on a contraption that moved North, West, as well as South and East.