Casper Smart is like a gremlin ... whatever you do, DON'T GET HIM WET!

With the rain coming down pretty hard in NYC on Wednesday, J.Lo's boy toy was safely sheltered from the elements with TWICE the amount of umbrella assistants as Jennifer.

Being the luckiest backup dancer in the world has its perks ... for now.

Jennifer Lopez -- wearing a tiny bikini -- was escorted off the set of a music video shoot in Ft. Lauderdale this weekend after three gunshots rang out right near the production.  

Lopez seemed very cool, calm and collected as her BF Casper Smart walked her to a nearby trailer.

Police say the incident occurred at the northernmost point of the Ft. Lauderdale Beach Park ... while Lopez and Pitbull were shooting the video in the southernmost end of the park.

The Miami Herald quotes security officials saying Lopez was "secured inside her vehicle" at the time of the incident ... but a reporter for "ET" says he was interviewing Lopez when the shots were fired and "security scrambled her away."

When cops arrived to the scene, a witness told police he saw the shooter. So far, no arrests have been made.

Marc Anthony and his kids hit up Disneyland with his new girlfriend who is both hot and billionaire-adjacent.

The new GF is Chloe Green, daughter of UK billionaire Sir Philip Green, whose estimated net worth is $5 billion.

It's a good bet Sir Philip provides his daughter with an endless supply of loot. He reportedly dropped $6 million on his son's Bar Mitzvah -- a lot more impressive than a bunch of useless savings bonds.

In related news ... Casper Smart just got a big raise in his allowance.

Jennifer Lopez and Casper Smart are FURIOUS over reports Casper was "caught" in a "gay sex club" and an exotic massage parlor ... and now they're threatening to sue ... claiming the stories are pure BS.

TMZ has learned ... the couple's high-powered attorneys, Shawn Holley and Howard Weitzman, have teamed up and fired off letters to Star Magazine and In Touch ... warning them the "reports" are "false, malicious and defamatory" and will cause "immense damage" to the couple's careers and reputations.

The reports include photographs of Casper outside a XXX peep show in NYC back in July -- Star claims the shop is a "well-known cruising spot for gay men looking for instant hookups."

In Touch claims Casper was "caught" with an "exotic masseuse."

In their letters, the lawyers have each demanded the mags print a full retraction ... warning Smart and Lopez will "immediately file a lawsuit" if the magazines fail to do so.

We reached out to Star and In Touch -- so far, no word back.

Jennifer Lopez is having a very, very happy birthday ... that is if Casper Smart found something special during a XXX shopping trip. Hope they didn't ask for ID ... he's real young.

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Marc Anthony isn't just on good terms with his estranged wife Jennifer Lopez ... he's also on good terms with the guy who's bangin' her ... at least judging by this photo.

TMZ has obtained a photo of Casper Smart in a great, big bro hug with Marc at a private airport in NY yesterday.

We're told the kids -- Emme and Max -- have been hangin' with J.Lo and Casper during the most recent leg of Jenny's international tour ... and when they arrived back in the States on Monday, daddy was right there to greet them.

Sources tell us ... things seemed very friendly and the kids appeared happy to see their dad.

Jennifer Lopez isn't the only one running around town with a hot piece of ass who's half her age ... Marc Anthony's got a hard-bodied 24-year-old of his own ... and last night, he trotted her out in a SKIN-TIGHT sausage-casing of a dress.

43-year-old Anthony has been dating Venezuelan model Shannon De Lima for several months ... and last night, the two strolled in to a private party together in Miami Beach.

With J.Lo still playing chaperone to her ripped boy-toy Casper Smart ... we gotta ask ...

Marc Anthony held out hope for a reconciliation with Jennifer Lopez, but decided to file for divorce when she told him ... she's madly in love with BF Casper Smart ... TMZ has learned.

TMZ broke the story ... Marc filed for divorce Monday -- nine months after the couple announced they were splitting.

But sources extremely close to Marc tell us, he didn't make the decision on his own -- he had a heart-to-heart with J.Lo a few weeks back to see if she really, truly wanted to end the marriage.

We're told he said he wanted to give the marriage another try, but Jennifer confessed ... she was deeply in love with Casper ... and wanted to pursue that relationship.

We're told Marc was blindsided ... he had not idea things were so serious -- and he was hurt.

So that's why Marc filed divorce papers this week.

Jennifer Lopez is drawing a line in the sand -- paying nearly a grand to rent out a public beach in L.A. last weekend ... to keep randoms away from her family and children.

Sources tell TMZ, Jennifer forked over $925 to the city of Long Beach to rent out Marine Beach on Saturday -- 3,400 feet of shoreline -- just for her, her kids, her BF Casper Smart and other family and friends.

To keep out the riffraff, we're told lifeguards marked off the water using buoys -- and kept the beach gates locked.

We're told J.Lo and co. brought their own jet skis for awesome fun times -- and even hired a wakeboard instructor.

Meanwhile, a bunch of sad locals stayed home and played with dirt.

Jennifer Lopez and her 24-year-old boyfriend Casper Smart were quite the lovebirds and enjoyed a Valentine's Day frolicking on the sand in Santa Barbara on Tuesday.

Besides holding hands and taking long walks on the beach, Jen even climbed up on top of Casper to ride the swing together.

In related news, Marc Anthony VD pics should surface in 5 ... 4... 3 ...

Marc Anthony and Jennifer Lopez possibly getting back together means only one thing -- J.Lo's boy toy Casper Smart better enjoy the Bentley and those sweet vacas while he can! Tick, tock ...