UFC champ Michael Bisping says he wants to fight Dan Henderson ... before Hendo dies of old age. 

It's pretty funny stuff ... Bisping is adamant he's not planning on retiring anytime soon -- telling TMZ Sports he wants to fight everyone from Hendo to GSP and even Rockhold again before he hands it up. 

But the best part of the video is all the shade he throws at 45-year-old Henderson -- "Henderson's gonna die soon, so I might as well knock him out. I might as well put him in the grave."

Good stuff. 

Christina Grimmie's killer was on a mission to make himself so appealing she couldn't resist him, and when it didn't work he changed his plan to kill her ... this according to his former co-workers.

Various people who worked with Kevin Loibl tell TMZ his infatuation with Christina was boundless. He went on a mission to change his appearance for her and, toward the end, got hair transplants and Lasik eye surgery. He also went vegan to lose weight.

He would also listen to her music at work and vow she would someday be his wife.

Loibl's Best Buy co-workers say he went to one of Christina's shows in March and hinted that he actually met her. The co-workers also say the Geek Squad killer claimed to have played online games with the singer. A source close to the singer, however, tells us Christina never had contact with Loibl.

And there's this. The co-workers say they teased Loibl that he would never score because Christina had a boyfriend ... her producer. That relationship was never public, but pictures of Christina and the guy together on social media made it pretty clear ... they were together. We're told that enraged Loibl.

That rage was vented last Friday after Christina's show, when he shot her in the head and then killed himself.

A website that makes money selling serial killer memorabilia is going dark in the wake of the Orlando massacre.

Serial Killers Ink has been in the game since 2009. Its stock in trade includes art, letters, photos and other personal items that belonged to infamous killers. A Charles Manson inmate card will cost you $850.

The site's owner, Eric Holler, says the time isn't right "to market violence." 

Holler confesses Orlando has made him rethink what he's doing, adding he's not packing it in, but he's suspending business until further notice.

File under: "You know you're rich when" ... you buy a 2nd jet 'cause you're bored with the 1st one! That's exactly what Floyd Mayweather did ... snatching up a new private jet 2 weeks ago ... TMZ Sports has learned.

Floyd's rep tells us, "It’s a 12 passenger Gulfstream III with gold cup holders, gold sink, gold accents throughout. It has all white leather seats and a fully stocked kitchen. He now has two jets. Air Mayweather 1 and 2."

We're told similar planes run around $37 mil ... but we don't know how much Floyd dropped on this particular jet.

Either way, it's good to be rich!!

Disney did a frantic make-good after the fatal alligator attack, comping many of the guests with free rooms.

A number of guests staying at Disney's Grand Floridian Resort & Spa tell us the hotel was turned upside down after the 2-year-old went missing. Various parts of the property were on lockdown, and no one from the resorts was cluing in the guests.

After some complaining, the resort offered free rooms, which averaged $560 a night. It's unclear if everyone got comped, but if they did ... with 867 rooms that's nearly half a mil. 

As we reported, Disney also has a big PR problem ... there were no signs near the lagoon warning of alligators, like some of the nearby competing resorts.

The Dalai Lama's favorite Richard Gere movie is not "Pretty Woman."

Our photog spotted His Holiness in Georgetown and pulled a fast one on the 80-year-old, asking him to pick his favorite Gere flick. The 2 have known each other for years ... Gere's a devout Buddhist.

So what would His Holiness pick?

"Ink Master" star Tyler Nolan was arrested in Florida and charged with possession of cocaine, ecstasy, weed and three guns, including a Remington shotgun.

According to the police report, Tyler was pulled over Monday afternoon in Cocoa Beach. When they approached the car, cops say it reeked of marijuana ... triggering a search.

Cops say they found a small bag of cocaine (less than 1 gram) and a gun on him. When they searched the car, cops turned up two bags of weed (14 grams), 6 pills of ecstasy and two more firearms, including a rifle and over 900 rounds of ammo.

Tyler -- who told cops he had the ammo after spending a few days at shooting ranges in the area -- was charged with three felonies (possession of coke, E and guns) and a misdemeanor for the weed.

He was released Wednesday morning on $18k bond.  

Calvin Harris suspected something was up with Taylor Swift weeks before their breakup ... and his suspicions were confirmed Wednesday when pics surfaced of Taylor making out with Tom Hiddleston ... this according to sources connected to the former couple.

Our sources say Taylor and Calvin were in a "committed relationship," but he suspected something was up in early May ... a month before their breakup.

As we reported, at the time of the breakup Calvin posted there was still "a huge amount of love and respect." Hours after the photos surfaced Wednesday, Calvin deleted the tweet.

We're told, "He's pissed and feels betrayed by her."

Taylor and Tom were out May 2, dancing at the Met Gala ... Calvin and Taylor announced their breakup June 2.

Calvin was mum Thursday. As for Taylor and Tom ... another song in the making.

Of all the huge stars supporting Donald Trump (Mike Tyson, Dana White, Tom Brady, etc) ... Donald Trump's son says the coolest person on the team ... is Bobby Knight! 

The college basketball legend famously joined Donald at a rally in Indiana back in April -- and Donald's son, Eric Trump, says he's super stoked about it. 

"Bobby was a great guy," Eric said ... calling him a "consummate winner" who probably has a lot in common with Donald. 

For his part, Knight called Trump "the most prepared man in history" to be president.

Oprah almost got tongue-tied when our photog asked her who runs the White House ... not as in the government, but the house in which the First Family lives.

O was in D.C. with FLOTUS for the first White House women's summit.  

Oprah's dramatic pause -- and answer -- are epic.

The man bound for the West Hollywood Pride Parade and armed with an arsenal fled to California in the middle of an investigation targeting him for having sex with a 12-year-old girl.

TMZ has learned James Howell has just been charged with felony child molestation. Howell is accused of having sex in a car with the girl on May 31 ... less than 2 weeks before the parade.

Jeremy Mull, the prosecutor in the Indiana case, tells us authorities believe he left for California in flight, after getting a call from cops and going to the station for an interview.

Authorities in Santa Monica -- where he was arrested -- say he was actually in the area to meet up with a man he met online.

Yolanda Foster didn't want to be treated like a second class citizen on 'Real Housewives of Beverly Hills' -- and decided to leave the show rather than be demoted from the main cast ... TMZ has learned. 

Foster announced she was leaving the show in an Instagram statement -- and implied that she was fired. 

But our production sources say that's not exactly the case ... telling us Yolanda was offered a role as a "friend of the cast" -- which would give her more free time to address her health issues. 

We're told Yolanda saw the move as a demotion -- since she was a full-fledged cast member in the past few seasons -- and refused to take a lesser role. 

Our sources say Bravo isn't bitter about the split -- and has let Yolanda know she is still welcome to appear on future episodes ... as a friend. 

Donald Trump is a great dad who figured out when to open the vault and when to keep it closed ... so says his middle son.  

Eric Trump was out on 5th Avenue in NYC Wednesday when our photog threw it out there ... no matter what people think of Donald's politics, they give him high marks for raising his kids.

Eric also bragged ... the Trump business is booming.