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TMZ spoke with Lena Griffin (pictured above left) -- mother of Miss January 2011(pictured above right) -- who tells us her daughter has NEVER been Hef's girlfriend -- adding, "the rumors that they are dating were just for publicity."

Lena explains -- "They met at a party a few years back, but they are JUST FRIENDS. That's what [Hef] means when he says Anna is his 'best girl'"

She adds, "It makes me feel so much better to know there is not any hanky-panky going on."

Our jewelry spies were there when Harris stepped inside Prospect Jewelers in La Jolla, CA, asking for an appraisal on the ring.

The owner asked Harris if there was any documentation on the quality of the ring (cut, clarity, etc.,) but the playmate was in the dark. So Crystal called over to the Playboy Mansion -- on speaker phone -- for info on the ring. The person on the other end of the line offered to fax Crystal the info -- but not immediately -- so Crystal left.

Our spy overheard the owner telling Crystal he was sorry to hear about Hef, to which Crystal replied, "Are you kidding? It was all for publicity."

According to our sources, Hef has a new main girl -- Miss January 2011 Anna Sophia Berglund (above left). According to our sources, Anna has now moved into Hef's room and the two have taken to calling each other "babe" around other people. We're told during a recent movie night at the Playboy Mansion, the two were cuddling and kissing during the entire movie.

One source put it bluntly -- "It's clear Hef has moved on to Anna."

Sources close to Crystal tell us that while Anna was never singled out, the constant presence of girls around wore on Crystal and played a role in her decision to call it off.

And who says Hef isn't maturing? Anna is a whole 24 days older than Crystal!

Sources close to Harris tell TMZ ... Heidi reached out to her shortly after the breakup with Hef to offer her moral support. Bottle blondes need to stick together!

The pair decided to spend what would have been Crystal's wedding day in Las Vegas. They couldn't just go to Sin City on the down low -- instead they are hosting a party at WET REPUBLIC pool at the MGM Grand Hotel & Casino.

We broke the story this morning -- Karissa pulled a bait-and-switch on the "Smallville" actor yesterday, lying about moving back into the Mansion with her sister ... so Jones would help her pack before she dumped him.

But something changed in the last few hours -- because the twins just rolled up to the Mansion, telling us, they're moving back into Hugh Hefner's palace after all.

Sources close to Crystal and Jordan tell us Dr. Phil's son gave her a shoulder to cry on when she fled the Playboy Mansion -- but most of their time has been spent in a Hollywood recording studio ... where they are working on Crystal's new album.

Jordan is a singer/songwriter who used to be on the same label as Crystal.

Before Crystal called off the wedding ... just days before their wedding ... Hefner had already agreed to give her the July cover with the headline, "Mrs. Crystal Hefner."

Box loads of magazines have already been shipped without the sticker -- but Hefner insists the big, red mark WILL appear on newsstands.

Ex-fiancée Crystal Harris went on KIIS FM with Ryan Seacrest this morning -- days after she called off her wedding with Hef -- claiming the Playboy mogul has now bowed out of the marriage game ... for good.

According to Crystal, Hef had only agreed to marry her because he believed it was what she wanted -- and he was actually RELIEVED when she called the whole thing off.

Sources close to Crystal tell us she was fed up with the "couple hundred dollar" weekly allowance she got from Playboy -- and wanted to make her own cheese.

We're told Crystal purely focused on launching her music career -- even with the wedding just days away.

Our sources -- who are all at the mansion -- say Crystal, 25, and Hef, 85, had a nasty argument this weekend on the phone. When the dust settled Crystal decided to 86 the nuptials and quickly moved her stuff out.

The wedding was supposed to go down Saturday. It would have been Hef's, umm ... third marriage.

UPDATE: Hef just tweeted -- "The wedding is off."

A lot ... according to Denise Underhill -- who's filed a lawsuit against Playboy, claiming she suffered a devastating knee injury during a bouncy photo shoot at the mansion back in 2009.

According to the suit, filed in LA Superior Court last month, Denise claims she was "requested to jump on a trampoline ... in order for photographs to be taken of her." We're guessing Denise has a huge smile.

During the jumping session, Denise claims she tore the meniscus in her right knee ... but instead of proper medical assistance, she was merely given crutches and sent on her way.

In the docs, Denise claims "There were no warning signs posted ... as to the dangers posed by the use of the equipment." She has a point, even shampoo has directions.

Denise claims the injury required surgery -- and she's demanding more than $25k for her troubles.

A call to Playboy was not returned.

According to law enforcement sources -- cops initially stopped 31-year-old Stokes around 12:30 AM for blowing through a stop sign in Hollywood.

But during the stop, cops learned there was an active warrant for Stokes' arrest stemming from a previous traffic violation. Cops then performed a search of Stokes' car and found methamphetamines.

Stokes was arrested and taken to a nearby jail -- where she was booked on a felony drug possession charge.

Moments before the shoot, Bree tweeted the above picture with the caption "So EXCITED!!!"

Bree -- who dumped Charlie Sheen last month via text message -- reportedly swore off the adult industry after she started dating the Warlock ... but now that the relationship is over ... it appears she's easing up on her no-adult policy.

So far, no word on when the spread is set to hit the shelves.

Brian Sapir -- owner of HHT -- tells TMZ, "Tours are quickly filling up with recent requests to go by Vickers' dilapidated, haunted, and eerily abandoned Beverly Hills home."

As we previously reported, Vickers' decomposing body was discovered in her home by a neighbor earlier this week -- and investigators believe the 82-year-old was dead for months before she was found.

Sapir adds, Vickers -- who starred in the 1958 classic "Attack of the 50-Foot Woman" -- will "always remain a Playmate beauty, but only in her recent death, as a mummified corpse, does she once again receive star billing."

82-year-old Vickers -- who famously starred in "Attack of the 50 Foot Woman" -- was reportedly a recluse ... and neighbors say they hadn't seen her since last Summer.

A neighbor decided to inspect the house after noticing old letters and cob webs in Vickers' mailbox ... and noticed the model's badly decomposed remains in an upstairs room. The neighbor claims a small space heater was still running when she discovered the body.