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Justin Bieber is on an absolute tear in Ibiza, and his latest conquest might be his best -- the Playboy Playmate he held a late night make out session with on a yacht.

Biebs was photographed hooking up with Miss July 2013, Alyssa Arce on Thursday night. Our sources say she and Justin met on Wednesday ... and ended up hanging on the same yacht. Funny how that happens in Ibiza.

22-year-old Alyssa is signed with Wilhelmina LA, and we're told she hit it off with Justin almost immediately -- but it's nothing serious just yet.

As one source put it ... they're just "having fun."

Amen.

"Party Down South" star Ryan "Daddy" Richards was investigated for rape and CLEARED ... after cops viewed 20 hours of videotape.

A woman partied with the cast in Athens, GA in April ... first in a local bar and then in a house the show rented. She reportedly told police someone gave her an already opened beer and that's all she remembered. She says the next thing she knew she was naked under a bed sheet with a camera in her face.

The police report lists Richards as a suspect, but we've now obtained documents which make it clear ... after an investigation cops concluded the allegation is unfounded.

Show sources tell us after reviewing 20 hours of footage -- along with interviewing cast and crew -- cops determined she was conscious and partying along with everyone else.

As for why the case was pursued ... the woman went to the hospital the day after the party and a nurse concluded there was evidence of sexual assault.

Lisa Vanderpump is selling Villa Blanca, the restaurant she made famous on "Real Housewives of Beverly Hills," TMZ has confirmed.

Real estate sources tell TMZ ... Hilton & Hyland -- as in Rick Hilton -- has the listing.

Lisa is coy about the sale, telling us she merely wanted an appraisal because people have expressed interest in buying the joint. But our real estate sources say Hilton & Hyland have the deal and are actively looking for a buyer.

The move comes weeks after the restaurant was socked with a $100,000 punitive damage judgment. Former waitress Karina Bustillo won that plus another $6K in her sexual harassment lawsuit.

Paris Hilton and boyfriend River Viiperi are on the outs, cause she was sucking face with some guy on the beach this weekend ... someone other than River.

Hilton and her new male model friend Josh Upshaw were in Malibu Sunday when they got deep into a make out sesh ... right in the open. According to our sources, Paris and River ended their relationship amicably recently.

Neither has spoken about the break-up, but they haven't been seen together for several months now.

The River no longer runs through it.

If you look up the definition of "irony" ... you'll find this video of Lauryn Hill, who had the nerve to snap at a fan for being disrespectful -- despite the fact SHE was severely late for her own show.

Hill played the House of Blues in Chicago last week, and our HOB sources tells us she was supposed to start playing at 10:30 -- but took her sweet time, and didn't actually make it to the stage until 11:20.

Once she did, most accounts say Lauryn's opening song performance was terrible, and when a fan called her out and flipped her off ... she berated him and had him tossed by security.

The person who shot this video tells TMZ they decided to leave after 2 more songs (which they called "rushed and sloppy") ... and say they saw a huge line of people at the box office asking for a refund.

Mark Ruffalo has one less reason to Hulk out -- "The Avengers" star lost his wallet in Chicago, but it was returned by a total stranger ... who had no idea he was dealing with a big time celeb.

Ross McHale tells TMZ he found the wallet in a cab last Friday ... and saw Ruffalo's name on an ID, but didn't recognize the name so he Googled it.

McHale's clearly not fan of the Hulk, "Zodiac," or "54" ... because he says Mark's creds still didn't ring any bells. But he did get enough info to reach out on Twitter, where Mark eventually responded ... "Thank you! Wow! Another point for the decency in people."

Ruffalo didn't offer a reward, but Ross is hoping for a pay-it-forward kinda deal. He tells us ... "If [Mark] ever finds my wallet I expect him to return the favor."

Primus drummer Tim Alexander suffered a heart attack Thursday ... and now he's waiting for doctors to fix his ticker via open heart surgery.

Alexander was rushed to a local hospital after he was hit with the attack ... according to a rep for his other band Puscifer.

Tim was the original drummer for Primus ... but he took a 7 year break from the band in '96. Their biggest song was the '93 classic "My Name is Mud."

We're told doctors hope to get him into surgery Monday.

First a female Thor ... now a Black Captain America ... it's about time the universe of comic book heroes had some diversity ... so says rapper/actor Common -- who once saw his own superhero dreams crushed.

Common tells TMZ ... he applauds Marvel's decision to have a Black Cap, calling it "a beautiful thing."

Marvel announced Wednesday The Falcon -- aka Sam Wilson -- will become Capt. America in the comic book series.

Common may still be smarting from 2008 ... when he was cast to play Green Lantern in a movie that fell apart during the Hollywood writer's strike. He says he'd STILL love to play the part.

As for Captain America ... Marvel says The Falcon will appear as Cap only in the comic books ... not in the movies.

9:32 A.M. PDT -- Sources close to the show tell us ... producers had an emergency meeting Tuesday night to address how to proceed with reunion episode -- which continues filming today. We're told cast members will be kept in separate areas during filming ... and they've done away with the live audience for safety reasons.

A huge brawl erupted during the taping of the "Love and Hip Hop: Atlanta" reunion show in NYC Tuesday night … leaving several cast members -- and their weaves -- injured.

Multiple sources on the set tell us the fight involved Benzino, his fiancee Althea, Stevie J, Joseline, Debra, Tammy, and Mimi -- and the whole mess started when Benzino cracked a joke about Stevie J and Joseline doing drugs.

We're told Stevie jumped up to get in Benzino's grill, but security guards stopped him. That's when --according to witnesses -- Stevie's girl Joseline sneak attacked Althea.

After that, all hell broke loose -- weaves were torn out in the chaos -- and every time security broke up one fight … a different one would spark up between other cast members.

We're told most of the fighting was between the women -- although at least one male security guard took a shot to the face … from one of the chicks.

From what we can tell the only smart decision all night was someone calling 911. Cops and paramedics responded -- at least three people got treatment.

We know what you're wondering, and the answer is -- YES … we're told VH1 cameras were rolling during most of the violence.

The seeds of ratchetness appear to have been sown Monday night ... when a nude pic of Benzino and Althea was posted on Stevie J's Twitter page.

Kylie Jenner has broken the law AGAIN behind the wheel of her Mercedes.

Kylie was pulled over on the 101 Freeway Monday after cops noticed she was driving her G-Wagon with tinted windows. The CHP officer looked inside and saw the 16-year-old was driving with a friend.
Here's the problem. There's a law in California ... a new driver who is 16 can't have a teenager as a passenger unless there's also an adult 25 or over who is accompanying them.

So Kylie got 2 tickets -- one for tinted windows and the other for driving with a teen -- which add to her vehicular hijinks. She crashed the same SUV last August, 18 days after she got her license. And she also got a ticket allegedly for speeding in January.

They need that reality show to pay her insurance premium.

Someone peed all over Ryan Seacrest's leg at LAX this weekend, and she happens to be his latest hot blonde chick gf ... Shayna Taylor.

We're talking metaphorical urine -- but Ryan and the 23-year-old model were spotted on their way back from a fabulous vacay when a photog asked her, point-blank, about bagging Seacrest ... and she finally answered ... loudly and proudly!

We first spotted them together back in December, but neither ever publicly admitted dating. 8 months later something's changed.

Sources connected to the couple tell us they spent 2 weeks in Europe, so it was either one helluva vacation -- or she's got one helluva an ass. Or both.

Tyga's baby mama has some 'splaining to do ... because Sunday in Malibu she got their Rolls-Royce Phantom impounded -- for a really dumb reason.

Law enforcement sources tell us Blac Chyna was pulled over after cops got complaints a matte black Rollie was being driven erratically ... and since there aren't too many of those $300k whips toolin' around, they quickly found Chyna and pulled her over.

That's when the real trouble began ... during the stop, cops ran BC's plates -- she was driving without a license, so they impounded the vehicle -- and will only release it to a licensed driver.

There are at least two reasons to love Selena Gomez today because TMZ has confirmed the following about this much discussed top-heavy photo: THEY'RE REAL!

Ever since Selena was spotted in NYC this week looking perky and free -- there's been rampant speculation about a possible boob job. But sources extremely close to SG's tank top tell us the assets are original issue ... and not enhanced in any way, shape or insanely good form.

Upon much closer inspection of the entire set of pics (we love our jobs) -- Selena's chest was merely bouncing while she walked. The camera just caught her chest on an upstroke.

Justin Bieber and Selena Gomez are desperate to make each other insanely jealous ... at least that's how it looks after they both flaunted their dinner dates with new people.

The first shot came from Selena on Wednesday night when she hit Tao in NYC with 26-year-old model Tanz Watson ... who wasted no time posting a sexy pic of Selena pressed up against him.

Then the Biebs responded last night with his own Instagram of himself and model Yovanna Ventura at dinner in LA with the caption, "dinner for 2 ;)."

Sources close to the exes tell us Justin religiously watches Selena's every move on social media -- so this is no coincidence.

As for who's winning the war -- well, Beliebers have already coined the term, Jovanna for Justin and his new chick.

Your move, Selena.

Honey Boo Boo absolutely inhaled a giant slice of watermelon, and taught a table full of kids a valuable lesson -- she will RUIN YOU in competitive eating!

It all went down in Panama City, FL -- where HBB and the fam are vacationing -- during a children's watermelon eating contest, and honestly ... Joey Chestnut himself would applaud the 8-year-old girl's performance.

It's clear from the video -- the 7 other kids never stood a chance. Just like that poor, poor melon.