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Katy Perry's family and friends just scored HUGE, thanks to her scooping up a quaint little guest house. Kidding ... she bought 'em a freakin' mansion!

Take a look at Katy's SECOND home in Bev Hills -- it's 4 bedrooms and 5 bathrooms spread over 4,400 square feet. It's got French doors opening out to a kick-ass outdoor area for entertaining, and a pool area for 90210 lounging.

The crib is in a gated community which has also been home to Ellen Degeneres, Ashton Kutcher and Mila Kunis, Jennifer Lawrence, Adele ... and also Katy. Yeah, she bought a $19 million, 5 bedroom spread last year in this hood.

Don't worry ... Katy's not downsizing. She's keeping the OG place, deciding to add the second as a place for family and friends to stay when they're in town.

Asking price on the new home is $7.5 million, and we're told she's paying close to that. All the contingencies have cleared, and we're told the deal will close next month.

One high-end real estate developer is going green ... building weed-friendly mansions for athletes, CEOs and celebs looking to harvest their own herb at home and take advantage of the plant's healing powers without ever having to get off the couch!

Ramtin Ray Nosrati of Huntington Estate Properties is building 5 marijuana mansions in Bel-Air and Westside, and each residence contains a cannabis conservatory ... it's basically a stoner's spin on a cigar room, specifically designed for blazing up and growing ganja.

The individual homes -- call them the houses that hemp built -- are being advertised to active and retired athletes who are interested in at-home, anti-inflammatory medicine for daily life ... because THC and CBD can do wonders for all the physical and mental stress that comes with being one of the world's elite ballers.

Check out the gallery ... the special cannabis room inside each home comes with its own dedicated harvester, who will work magic for 2 years cultivating, watering, fertilizing and harvesting crops and/or vegetables using organic hydroponics. In Los Angeles, you can grow up to 6 plants in your home. Sounds dank!

Sofia Richie's looking purrrrrty Down Under ... so good, in fact, Scott Disick even snapped ... snapped a ton of pics.

Sofia showed off her hard bod Monday while rocking this leopard print bikini aboard a yacht in Australia. No question about it ... the show belonged to Sofia, and Lord Disick agreed -- he practically bowed down to her grace.

Halloween is the perfect time to get into some crazy characters ... luckily Hollywood is full of them, and there's really nobody else that can pull off an A-list costume better than another celebrity and their good looks!

Scroll through our gallery of stars like Paris Hilton as Miley Cyrus, Kylie Jenner as Christina Aguilera and Beyonce as Lil' Kim to see which stars switched up their famous facades for the Halloween season.

Halloween in Hollywood means everyone is dressed to impress ... but it's up to you to decide which famous look takes the costume crown!

The TMZ newsroom got slammed with your freaky photos for our Pet Costume Photo Gallery, and now's your chance to see who made the creepy cut!

We've collected a bunch of your dressed up pets like cops, ghosts, witches and even real housewives for your Halloween viewing pleasure.

Tons of celebs hit up the annual Casamigos Halloween party Friday night ... and it did not disappoint.

The soiree was hosted by Casamigos founders George Clooney and Rande Gerber at the Bev Hills home of Mike Meldman ... a developer and tequila tycoon.

George was a no show, but there were plenty of stars, including Brandi Glanville, Cindy Crawford, Dave Grohl, Harry Styles, Paris Hilton, Diddy, Zoe Kravitz, Seth McFarlane, Nicky Hilton, French Montana and Ryan Seacrest.

The bash offered up some good grub ... Kobe cheeseburger sliders, truffle fries, chips and fresh guac and pizza. And of course ... Casamigos ice shots and Margaritas.

Cesar A. Sayoc, the suspected bomber in a domestic terrorism plot targeting high-level politicians, worked as an exotic dancer for years and even threatened to kill and infect other dancers with HIV ... TMZ has learned.

As you can see from the photos ... Cesar worked as an exotic dancer from 1996-2000.

We're told Cesar's time as a stripper was tumultuous ... on several occasions, he threatened other dancers and was constantly jealous of colleagues who were making more money than him or diminishing his presence on stage.

According to dancers who worked with him ... Cesar once threatened to stab another dancer with a syringe loaded with HIV-infected blood.

We're told Cesar once got so jealous of a rival dancer, he taped tuna can lids to the bottom of his boots and threatened to stomp the dancer's face and cut him up. When people laughed at him, he became enraged and said, "Just wait. I'm going to take this guy out."

It's interesting ... Cesar traveled the country in a van during his stripping days, and Friday he was busted in a van covered with stickers threatening Hillary Clinton and CNN personalities. He also made multiple violent threats against TMZ on social media.

Even more disturbing ... we've obtained video of Cesar wiring accessories he used to light up stripper's costumes during his time with Gold Productions.

Blac Chyna's getting ready to move into a new crib ... and it cost her a pretty penny.

TMZ's learned BC just threw down $3 million on a pad in the San Fernando Valley. The house is a knockout -- 6 bedrooms, 6.5 bathrooms sitting on nearly half an acre. It gets better ... the 7,054 sq. foot home also features a guest house with 2 bedrooms and 2.5 bathrooms.

Guessing Chyna's big on wine ... the house has a custom-built glass wine cellar. Here's to more wasted appeals!!!

Don't let these two almost identical images of Heidi Klum freak you out ... Clown around a bit and see if you can figure out the differences between these two spooky snaps!

Disappointed in this year's World Series games?? Here's something that'll cheer you up ... the players' smokin' hot WAGS!!!

Boston and L.A. haven't played the most competitive W.S. so far ... but they've hit plenty of home runs off the diamond -- just look at their wives and girlfriends!!!

Justin Turner's wife, Kourtney Turner, steals the show ... but Kike Hernandez's fiance, Mariana Vicente, and Alex Wood's wife, Suzanna Villarreal, came to play too.

In Boston's lineup, Catherine Rodríguez is as hot as an Eduardo Rodríguez fastball ... and Matt Barnes' fiance, Chelsea Zara, rocks the hell out of a bikini.

John F. Kennedy fans can hit the jackpot with tons of personal items belonging to the famous Prez ... assuming they have a small fortune to spare.

The guys over at RR Auction have a bunch of JFK's stuff including his Harvard cardigan sweater and assassination-related items ... like an original window sash from the Texas School Book Depository and a Lee Harvey Oswald handwritten letter.

JFK's sweater is expected to fetch upwards of $30k. The window sash could go for $25k. It has its original glass and dark green paint just as it did on November 22, 1963 ... the day Oswald opened fire from the book depository, killing President Kennedy.

Oswald's one-page, handwritten letter was addressed to his mother ... but intended for his wife. It's one of the items for more frugal bidders ... expected to go for a paltry $6,500.