Halloween

Meghan Markle and Prince Harry left their Montecito cocoon for Halloween ... walking around Santa Barbara with their kids -- and Markle put on her best butterfly impression.

The former royals were out and about with their children, Lilibet and Archie ... going door to door with the rest of the normies and asked for some sweet treats on the holiday.

Archie and Lilibet dressed as an ant and firefly respectively while their mom dressed as a butterfly.

Lily Allen's getting clever with the marketing for her new album ... using a beloved childhood character to push a song allegedly roasting her estranged husband.

The singer-songwriter stepped out on Halloween night with some pals in Los Angeles ... dressing as Madeline -- the intrepid French heroine from a series of children's books.

Allen looks just like her in her baby blue jacket, bright red wig and straw hat ... and she stopped to pose for the cameras before heading into the Vas J. Morgan Halloween party.

Sia and her son looked ready to color in the Three Little Pigs together ... matching as a pair of pink crayons while going Trick-or-Treating amid a vicious custody battle.

The singer-songwriter took her one-year-old son, Somersault, around their Los Angeles neighborhood Friday ... and, the two dressed in their bright pink outfits -- with the little dude sitting up in his mom's arms.

Sia looked happy while out with her kiddo ... smiling wide in multiple photos -- and, Somersault got off his feet while rolling around in a stroller which was pushed by a man who appears to be his uncle Jon Bernad -- his dad's brother.

Meek Mill had a scary end to his Halloween night -- he was detained by New York City Police Department officers ... and he says it was for no reason!

Here's the deal ... video is circulating online that shows the rapper standing with his arms behind his back, seemingly being questioned by police as supporters rally behind him early Saturday morning.

A spokesperson for the NYPD tells us police responded to reports of a male with a firearm at just after 4 AM this morning ... which led to officers stopping three men in a vehicle matching the description and license plate they received.

Donald Trump's celebrating the Roaring '20s ... and, a whole lotta people online are calling him tone deaf as many in poverty are staring down a Great Depression.

POTUS hosted a "Great Gatsby"-themed party at his exclusive Mar-a-Lago resort in Palm Beach for Halloween ... with ladies dressed as flappers and fellas throwing on their most boisterous suits and fedoras.

The bash was reportedly titled "A Little Party Never Killed Nobody" ... which is the name of a 2013 song by Fergie, GoonRock and Q-Tip made for the Leonardo DiCaprio and Carey Mulligan 'Gatsby' film.

Justin and Hailey Bieber are proving their love is as 'incredible' as ever ... dressing up as the fam from "The Incredibles!"

The Bieber bunch was decked out in head-to-toe gear from the animated Disney movie for their Halloween costume this year, with with Hailey as Elastigirl, Justin as Mr. Incredible and their 1-year-old son Jack as Jack-Jack.

Kourtney Kardashian and Travis Barker are back with another spot-on couples costume for Halloween ... dressing up as Jack and Sally from "The Nightmare Before Christmas!"

The pair absolutely crushed their looks, with Kourt even rocking a wig to replicate Sally's ghoulish glow, and the Blink-182 drummer painting his entire head white to bring his costume to life.

The pair posted an on-theme video on Instagram to celebrate -- cruising down the street in a vintage black Chevy Impala convertible with "This is Halloween" playing from the 1993 film's soundtrack. It's not clear where they're heading ... perhaps to Halloween Town to visit some monster pals!

Heidi Klum held true to her promise by rocking an "ugly" but recognizable Halloween costume -- she dressed up as the Greek mythological figure Medusa for her annual Halloween party!

We got a peek at her walking onto her red carpet and into her epic celebration at Hard Rock Hotel New York City Friday night, and her costume was certainly a head-turner.

Just check it out -- she was covered in green scales that tapered into a long rattlesnake’s tail behind her, and she's even got animatronic snakes as hair! Not to mention the layers of green makeup and prosthetics that certainly took hours to perfect.

Justin Trudeau's giving a nod to his new boo Katy Perry with his Halloween costume ... and he even got his son involved.

The former Canadian prime minister joined forces with his son for a joint costume this year ... Justin's in a shark suit and his son Hadrien is a bloodied surfer whose board is missing a chunk from a shark bite.

It's a pretty cool father-son costume ... even before considering the reference to KP.

Denise Richards is ready to do some serious party hopping this Halloween ... with the actress looking smokin' hot as a Playboy bunny!

In a series of snaps she dropped on IG ... Denise is rockin' a skin-tight classic bunny costume that shows off her assets.

It's a fitting look for tonight ... since as you recall, DR posed for Playboy in the December 2004 issue, months after giving birth to daughter Sami.

Robert Englund got his star on the Hollywood Walk of Fame ... and the dude totally paid spooky homage to the horror character he made an icon.

Here's the deal ... Englund was honored with a star on freakin' Halloween for his decades in the biz ... scaring the hell out of us as the nightmare-stalking serial killer, Freddy Krueger.

And Englund made sure to give Freddy his due ... sporting the trademark knife-claw glove!

Julia Fox's choice of Halloween costume might have been embraced by her fans ... but  Jack Schlossberg wasn't one of them.

Julia decided to dress up as Jackie Kennedy Onassis -- Jack's grandmother -- for The Cursed Amulet's Halloween party in New York City on Thursday night.

We know it sounds innocent enough, but get this -- Julia opted for a version of the former first lady's blood-soaked pink suit Jackie wore on November 22, 1963, when her husband, John F. Kennedy, was assassinated in Dallas, Texas.

Move over, Lamar Jackson ... Jeff Hardy has a new favorite NFL player now -- thanks to Jahmyr Gibbs' Halloween costume tribute!!

We chopped it up with one-half of Team Extreme after Gibbs went viral for his 'fit at the Detroit Lions' holiday party this week ... and his efforts are being acknowledged by the man himself!!

"My mind was blown," Hardy said of the costume. "Lamar Jackson used to be my favorite NFL football player, so now I've got a new one."

This itsy-bitsy spider is makin' it rain! Can you guess who spun her wicked-hot web on social media in this eye-popping shot?! Grab your candy buckets and see if you can unwrap this sweet star!

She's an actress known for "Players," "Smoky Knights," and "Powerless." If you're still unsure, maybe her sister Vanessa can help you out 😘!

It's officially Halloween -- which means it's time for TMZ to show off our all-out costumes, reppin' some of pop culture's most iconic moments, entertainment legends and more.

Clearly, our fearless leader Harvey understood the assignment ... dressing up as the redwood tree from Taylor Swift's song "Wood" all while wearing a Kansas City Chiefs jersey -- 'cause we know who Tay's talkin' about in the cheeky song!

We've even got a special Labubu for you -- and no, he's not up for grabs!

Gather around, come near, because Halloween's finally here, and we're looking back at our favorite celebrity costumes over the years!

But don't worry, boys and ghouls, you won't catch a fright, it's all in good fun, especially when the stars go trick-or-treating at night!

We've got images of Harry Styles, Lizzo, and Nick Cannon in store -- wait, did you think that was it? No, there's way more!