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Joan Rivers' daughter Melissa has retained a law firm that will file a major lawsuit over her mom's death ... TMZ has confirmed.

We're told the firm -- Gair, Gair, Conason, Steigman, Mackauf, Bloom & Rubinowitz -- will file a medical malpractice and wrongful death lawsuit against the clinic where Joan stopped breathing and the doctors who were involved.

Our sources say Melissa retained the firm Tuesday, but the suit won't be filed for around a month.

We're told letters are going out today to the various people involved in the fatal medical procedure, telling them NOT to destroy records involving Joan's treatment. The lawyers also want phone logs and other documents.

As we reported ... one of the driving forces for Melissa is to figure out how her mom died, but in the end, it's a lawsuit over money.

Kris Jenner says she is NOT banging the guy she took to Kim Kardashian's birthday party ... but who is she kidding?

The picture is the latest linking Kris and Corey Gamble -- one of Justin Bieber's road managers -- whom she took to Vegas for Kim's 34th over the weekend.

Our Kardashian sources are sketchy on the subject of their relationship ... they say it's "not serious." No one says that about a non-existent relationship, so clearly there is one.

One source says, "I wouldn't say they're dating yet." Yet.

Here's the other thing ... you don't bring random friends on a private jet to your daughter's birthday.

Your move Kourtney.

Officials in the Dominican Republic do NOT believe alcohol was a factor in the crash that killed St. Louis Cardinals outfielder Oscar Taveras and his girlfriend ... TMZ Sports has learned.

We spoke with reps at the Metropolitan Police Department in the D.R. who tell us ... Taveras was driving "very, very fast" on a wet road when he lost control and slammed into a huge tree.

Both Taveras and his GF were killed in the crash.

Officials tell us an autopsy is currently being conducted on Oscar -- but we're told there was no immediate evidence at the crash scene to lead officials to believe he was drunk behind the wheel.

Officials tell us the weather may have played a role -- because it had been raining around the time of the accident and the roads were slippery.

We're told ... Taveras is not the first person to have lost control and slammed into that particular tree -- another person died in the same exact spot last year under similar weather conditions.

Jack Bruce -- who sang some of Cream's biggest hit songs -- has died at the age of 71.

The singer/bass player's family revealed the news on his website Saturday morning ... and his rep tells us he died from liver disease. We're told he had been sick since January.

Bruce sang lead vocals on classic Cream songs like "Sunshine of Your Love" and "White Room."

The group also included Eric Clapton and Ginger Baker ... and they were all inducted into the Rock and Roll Hall of Fame in 1993.

Bruce was considered one of the best bass players of all time.

Editorial ... He was awesome. RIP

Rapper iLoveMakonnen went DOWN on Tuesday night -- instead of "goin' up" like he says in his hit song -- when he was attacked on stage by a fan.

iLoveMakonnen was performing his hit 'Tuesday' at SOB's in NYC ... when a large man in a grey hoodie walked up to the front of the stage (:08 in the video), and then grabbed the rapper and started throwing haymakers.

Watch the clip ... after getting in several hard shots, the attacker actually managed to slip away -- but sources inside the club tell TMZ the owners know exactly who the guy is ... and describe him as a "jealous fan." We're told he's been banned for life.

Cops never got involved -- no one called 'em -- and iLoveMakonnen wasn't seriously hurt.

Lady Gaga just gave a couple in England the most AWESOME engagement story ... by helping pull off a surprise marriage proposal during her concert.

Gaga called her friend Jay Lomax and his boyfriend Sean Martins out on stage Tuesday night in Manchester, England. Watch the video (around 1:17) ... Lomax gets down on one knee and pops the question.

Sean tells us he was completely shocked -- and it turns out the whole thing had been plotted for months by Gaga, Jay, and Jay's famous uncle ... photographer (and Gaga friend) Terry Richardson.

Martins says he only got suspicious when Lomax wouldn't let him drink too much at the concert ... and told him to take off his glasses before going out on stage.

Sean says his engagement ring is inscribed with the lyric, "We could belong together" ... from his and Jay's favorite Gaga song, "Artpop."

Martins says there's only one thing that could top the proposal -- having Cher perform at the wedding.

Serena William's swag just reached new levels -- 'cause the tennis superstar got herself a new luxury watch that comes fully equipped with 323 DIAMONDS!!!

It's called an Audemars Piguet Millenary timepiece -- made with 18-carat pink gold, a black mother-of-pearl dial and 323 brilliant-cut diamonds! The watch usually runs around $75K.

A rep for Audemars -- popular with celebs like Jay-Z -- says the luxury watchmaker has a relationship with the tennis champ ... but this watch wasn't a freebie from them.

"Serena is a friend of the brand but that isn't a piece we gave her," the rep tells TMZ Sports.

The war may be over -- but NY Knicks superfan Michael Rapaport couldn't help but take one last shot at Spike Lee ... and it was pretty hilarious.

Lee and Rapaport had been feuding for months over how to fix the problems in New York City -- Rapaport called Lee a "s**t stain" and Lee said Michael was "stupid."

But Michael recently told HuffPost Live they spoke on the phone and squashed the beef for good.

In fact, when we saw Michael out in NYC Monday ... he was PRAISING Spike as the biggest Knicks fan in the world -- even bigger than he is -- but dropped one last zinger at the famous director.

Ask and ye shall receive ... if you're Katy Perry and your dream is to have a giant pizza-themed birthday celebration.

The pop diva turns 30 in a few days and tweeted that all she wanted was her name on the marquee of the Shakey's Pizza parlor on Santa Monica Blvd. in Los Angeles.

The chain obliged Monday morning ... and a rep for the company tells us they're taking it a step further -- they plan on posting a b-day message on the marquee of all their California locations.

We're told the pizza spot also wants to name a pie after Katy, and throw her a birthday bash -- but so far, there's no firm plan in place with Team Perry.

Kylie Jenner and Tyga still deny they're a couple -- smart since she's 17 and he's 24 -- but that's not stopping them from flying together all over Europe, where it just so happens the age of consent would be more favorable for them to ... y'know.

Tyga and Kylie were spotted together at England's Gatwick Airport on Friday ... then traveled on to Bordeaux, France and Geneva, Switzerland ... before landing in Athens, Greece where Tyga had a gig Sunday night.

Seems odd that Kylie would go on tour with Tyga -- if they're just friends -- but then we noticed the age of consent for sex in those countries:

England -- 16
France -- 15
Switzerland -- 16
Greece -- 15

The consent age is 18 under Federal and California law. Of course, there's still no evidence they're banging -- and Tyga's been adamant they're NOT -- but ya gotta wonder if they read up on international laws before departing ... just in case.

Ronda Rousey hit up a local wrestling show Friday night in Reseda ... but it's what she did during one of the matches that has people talking.

The UFC women's bantamweight champ attended a Pro Wrestling Guerilla event ... and during one of the matches she was prompted by a wrestler named Tommaso Ciampa to chop his opponent's chest.

After some audience urging, Ronda reeled back and lit up the guy's chest -- the place went nuts.

Ronda rolled to the event with a few members of her posse "The 4 Horsewomen" -- MMA fighters Shayna Baszler and Jessamyn Duke -- and the whole group had no problem taking pics with wrestling fans all night.

Bruce Jenner is dating one of Kris Jenner's best friends ... TMZ has confirmed.

Our Jenner sources tell TMZ ... Bruce has hooked up with Ronda Kamihira ... a divorced, 51-year-old mother of 2.

We're told Kris is "extremely upset" that Bruce is dating Ronda, and -- as one source puts it -- "It really stings because Ronda never told Kris she started seeing Bruce."

And get this ... for years Ronda and the Jenners have been neighbors in Hidden Hills, CA, even spending holidays at each other's homes.

The daughters on both sides have become friends. Ronda's daughter, Spencer, took this pic with Kendall and posted it on her Twitter page.

A Jenner source tells us the talk within the family was that Ronda was weirdly becoming "Kris' single white female." The source says Ronda mimicked Kris right down to her hair.

This pic was taken at Staples Center in L.A., when Bruce and Ronda went to Elton John's concert.

And here's how awkward this is ... the pic (above) shows Ronda and Kris on vacation together in Dubai just a few years back.

Paul George has a new lady in his life ... his 5-month-old daughter Olivia ... who he met for the first time Thursday -- and now TMZ Sports has learned the NBA star is gunning for joint custody of the child.

As we previously reported, George swore that he would "do the right thing" if a paternity test proved he fathered a child with a woman named "Daniella" who he had a relationship with in 2013.

Now, we've learned George is convinced he IS the daddy ... and his attorney is currently in the process of hammering out a joint custody arrangement with the mom.

Paul's attorney tells TMZ Sports ... "Paul has always wanted to accept responsibility and play a role in his daughter’s life -- and wanted to make sure it was handled properly through the legal system."

We know Shaquille O'Neal rolls big, and now his pet fish do too -- in a massive $50,000 aquarium he had custom built into a freakin' big rig truck! Yeah, tropical fish can be badass.

Shaq posted a pic of his giant self yesterday next to his new baby -- a 3,000 pound tank complete with the Superman logo (a Shaq fave). It's framed by the cab of a tractor trailer ... which would dwarf any other fish tank owner.

The hosts of the Animal Planet show "Tanked" -- Wayde King and Brett Raymer -- designed and built the saltwater pad which houses dozens of exotic species like Miniature Groupers, Clown Triggers, Mappa Puffers, and even Dragon Eels!

Wayde and Brett told us it was one of the most unique projects they've ever worked on -- especially because hey had to load in the Dragon Eels ... which they called "a bit aggressive."

3:45 PM PT -- Misty's uncle says they've confirmed it's her body.

The "August: Osage County" star who's been missing since last week may have been found dead ... according to family members.

Misty Upham's family tells TMZ ... one of their search teams found a body in a ravine about an hour ago. They have not been able to reach the body yet because of the steep terrain ... but searchers believe it looks like Misty.

We're told the search team included family, friends and other members of the Native American community around Auburn, WA. They contacted police ... who are now sending officers to help retrieve the body.

As we reported ... Misty's Dad feared she had committed suicide when she went missing after going to visit friends. He says she'd recently changed the meds she was taking to control erratic behavior.

Story developing ...