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Post Malone needed a little pick-me-up before his show this weekend -- so, naturally, his pal hired a mariachi band to belt out his hit single to the tune of about $1,000.

Sources close to Post tell TMZ one of his buddies, Rich Chigga, ordered a song request from the best Yelp-reviewed mariachi band in Miami ahead of the rapper's gig Sunday at the Rolling Loud Festival ... 'cause he felt Post needed to get hyped before taking the stage.

We're told Rich met with the band ahead of time and gave 'em the lyrics to Post's single, "Congratulations" ... which they rehearsed before being dropped off at Bayfront Park by Postmates. Yes, they also deliver people.

The original cost was supposed to be $350 for a couple hours, but Post showed up super late and the tab ran up to $900 quick ... coming out of Rich's pockets.

For what it's worth -- again, $900 -- it looks like their version was Post approved. Felicidades!

Big Sean's latest concert was extremely expensive -- not for fans -- but for the bottom line on his tour ... after a downpour seriously damaged his stage.

Sean was a headliner at the Power 106 Powerhouse show in San Bernardino, CA -- along with Lil Wayne and DJ Khaled Saturday -- when a freak storm hit the outdoor venue. His video wall, which is a big part of his act, was drenched ... and after a 30 minute delay ... Sean had to carry on without it.

We're told damages are expected to run about $60k -- it's a big TV, after all.

Here's the screen in better days ...

NY Jets wide receiver Robby Anderson -- a rising star who had a solid 2016 season -- was arrested at a music festival in Florida this weekend after allegedly fighting a police officer, TMZ Sports has learned.

The 23-year-old was at the Rolling Loud music festival in Miami on Sunday --where stars like Migos, Gucci Mane, 21 Savage and Future performed -- when he got into it with security.

According to the police report, obtained by TMZ Sports, Anderson was fighting with security after being told to leave.

He refused and that's when a Miami PD lieutenant got involved and told him to sit on the ground.

That's when things went from bad to worse ...

"[Anderson] tensed his body and pushed [the officer]. [Anderson] was redirected to the ground and continued to fight with police and security."

Anderson was arrested for felony resisting arrest with violence and misdemeanor obstruction of a police officer.

In the police report, Anderson is listed at 6'3", 180 pounds.

The Jets were hoping for big things from Anderson in 2017 -- he had 42 catches for almost 600 yards as an undrafted rookie in 2016.

Mariah Carey got a Maybach for her birthday and, well, it didn't exactly float her boat.

Mimi was celebrating her belated bday Thursday night at Tao in Hollywood. She turned 47 back in March. The ride was a belated gift from her manager, Stella Bulochnikov.

Most people would've freaked out over a whip with a starting price of $200k. Mariah barely flinched.

Mario Maglieri -- former owner of Sunset Strip rock meccas The Whisky a Go Go, The Roxy Theatre and The Rainbow Bar & Grill -- died Thursday in Los Angeles.

Family friends tell us Mario died of natural causes at Cedars-Sinai Hospital. He'd been there for a few weeks because he wasn't feeling well after breaking his hip last month.

His family, including his wife of 72 years, Scarlett, was at his bedside.

Crowds at Maglieri's venues witnessed legendary performances over several decades. The Doors, Guns N' Roses, Van Halen, Led Zeppelin, Mötley Crüe, Cream and tons of others played those Sunset Strip clubs starting in the '60s.

Mario is often referred to as the King or Godfather of the Sunset Strip. He was 94.

#RIP #longliverock

9:13 AM PT -- TMZ Sports spoke with a witness who says the victims were shot in the knee, butt and arm.

Another witness says Roy was the person who was shot in the leg.

We're told the suspects ran to a getaway car following the shooting and drove off. The witness does not remember what kind of car it was.

Brandon Roy wasn't the only person struck by gunfire during the shooting in L.A. over the weekend, two other people were hit and cops are currently on the hunt for the gunman ... TMZ Sports has learned.

Law enforcement sources confirm ... the ex-NBA player and 2 other people were injured during a shooting in Compton, CA on Saturday night around 9 PM.

We're told all 3 victims are alive though we don't know how severe their injuries are at this point.

Our sources say Roy was NOT the intended target -- though it's unclear who was.

Law enforcement sources say a group of men approached the place where Roy was hanging out and one man pulled a gun and opened fire. Witnesses say no words were exchanged and it's unclear why the shooting took place.

We're told the shooter is an adult black male. Cops are looking for all of the men involved.

As for reports the shooting was gang-related, we're told cops are investigating that. We're also told the neighborhood where the shooting took place has a heavy gang presence.

Kendall Jenner walked away from Pepsi right onto a set with Kermit the Frog.

Kendall sat stoop-side with Kermit Tuesday in NYC's West Village for a Love magazine photo shoot.

Kendall and the sock were rocking high fashion garb from Miu Miu's Fall/Winter 2017 collection -- Kendall in red, and Kermit in ... well, you know.

There were pizza boxes, Dunkin' Donuts, and Cheerios, but get real ... they're props for the shoot.

Miss Piggy was also present. Maybe she ate the donuts.

The shoot is set to appear in issue 18.

WWE legend X-Pac was arrested at LAX over the weekend after cops say he tried to carry meth and marijuana through customs ... TMZ Sports has learned.

Jonathan Allen's having a helluva month!!!

Not only was he the 1st round pick for the Washington Redskins on Thursday ... but now we've learned he got engaged just 11 days before the draft!

Aaron Rodgers was spotted at an L.A. golf course Thursday with a very attractive blonde -- and we're told it's "Baywatch" actress Kelly Rohrbach.

Just a few weeks after reports surfaced he split with longtime girlfriend Olivia Munn -- the Green Bay Packers quarterback hit up the Westchester Golf Course.

Witnesses tell us Rodgers and Rohrbach appeared to be holding hands and looked flirty -- until they noticed people watching them.

Both Rodgers and Rohrbach are avid golfers -- so maybe it was just a platonic trip to the links.

Then again, maybe not.

The crap storm of Ja Rule's now cancelled Fyre Festival hurts the Bahamas as much as it does concertgoers ... in fact, probably more because tourism is EVERYTHING on the island.

Sources at the Bahamas tourism board tell us ... they were ecstatic about Ja's first annual "luxury" music fest because it was going to be a huge moneymaker and great pub for the islands.

We're told the Bahamas stands to lose out on millions with the festival being called off ... and tourism officials are devastated. The Ministry of Tourism released a statement saying it's "extremely disappointed" ... especially because it offered to help the fest organizers.

Our sources say event planners were in way over their heads ... grossly unprepared for an expected crowd of at least 6,000. However, they don't think the Fyre Festival was a scam, it was just too poorly organized to continue.

Cool moment from Snoop ... when he sent a personal, emotional video message to his former youth football player, John Ross -- praising him on getting drafted in the NFL.

Ross famously played in the Snoop Youth Football League as a kid -- and his family has been tight with Snoop ever since.

So, when Ross got drafted in the 1st round by the Cincinnati Bengals on Thursday, Snoop dug deep into his memory bank to deliver a pretty sweet message to the WR.

By the way, we got Ross right after the draft -- and he told us Coach Snoop can definitely expect some Bengals gear in the mail!

You're not seeing pink elephants ... that's just Justin Bieber's new grill.

Sources close to JB tell us he recently bought himself a new pink sapphire grill ... which ran him somewhere in the ballpark of $15k.

The mouthpiece comes courtesy of Gold Teeth God -- a jeweler based out of L.A. -- who we're told Justin flew out to Miami last week to do an impression of his chompers.

The grill is a combo of pink sapphire and rose gold, with 6 teeth covered on top and another 6 on the bottom. It comes with 6 carats of sapphire ... and took about 5 days to make.

We're told Justin has bought jewelry from GTG before, so going to him for the grill was a no-brainer. He seems to dig it, too.

All we can say ... love your grill, Biebs.

The man who shot and killed Joe McKnight says the ex-NFL player was fueled by a mix of steroids, pain pills and weed during their fatal confrontation ... and he only pulled his gun out of fear.

Ronald Gasser filed new court docs in the murder case against him -- claiming he learned McKnight "was under the influence of marijuana, pain pills, and anabolic steroids at the time [he] attacked Mr. Gasser."

Unclear where Gasser got his information -- it seems his legal team may have had access to McKnight's toxicology results following the autopsy.

However, in the docs Gasser paints a picture of a man in full steroid rage -- saying McKnight was "violent and erratic" following an intense chase through the streets of Louisiana on Dec. 1.

Gasser says he did NOTHING that he would consider "aggressive" to provoke McKnight -- and says it was Joe who was screaming and yelling like a maniac.

Gasser says he ultimately shot Joe while "fearing for his life."

At the time of the shooting, McKnight was a pro football player in Canada -- a running back for the Saskatchewan Roughriders.

Michael Mantenuto -- who played Jack O'Callahan in Disney's "Miracle" -- killed himself Monday in Washington State.

The actor, a former University of Maine hockey player, was found dead in his car by police in Des Moines, WA. The coroner tells TMZ ... Michael committed suicide by shooting himself.

As a budding actor with hockey skills, Michael landed the role in the Disney flick about the 1980 U.S. Olympic hockey team. He only acted in 2 other movies, and went on to enlist in the army ... and joined the Special Forces.

Col. Guillaume Beaurpere, commander of Mantenuto's army unit, announced his death.

He was 35.

Aaron Hernandez's legal team says the inmate who claims to have had a special friendship with the NFL star behind bars is simply trying to get money from the media ... and they won't dignify his claims with an official comment.

The inmate, Kyle Kennedy, has hired a lawyer after reports surfaced Hernandez wrote a suicide letter to him before his death. Kennedy claims they became very close in prison and spent a "great deal of time together."

Hernandez's attorney, Jose Baez, has previously shot down reports Aaron left a note for a gay prison lover -- and tells TMZ Sports his team has more important things to do than address Kennedy's claims.

"Our team is doing serious legal work," Baez says ... "We don’t have the time to stop our efforts and respond to every convicted felon that has something to say about Aaron Hernandez."

He adds, "Quite frankly I’m surprised more inmates have not come forward to make money off the media."