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Diplo made some tongue-in-cheek claims over the weekend that he dated Justin Trudeau -- and he kept the joke rolling with an IG selfie Monday, cozying up with the politician ... and his actual ex-GF Katy Perry!

Check it out -- the DJ posted a shot with Canada’s ex-PM, both pulling shocked faces for the camera ... with Katy in the background, totally unaware she was photobombing their little moment.

Diplo captioned the pic "the one that got away" ... a cheeky nod to Katy’s hit song and their brief fling back in 2014.

Gerry Turner is opening up about the brutal public backlash after his split with Theresa Nist ... admitting the 'Golden Bachelor' heartbreak hit him so hard, he spiraled into suicidal thoughts.

TMZ has obtained an excerpt of Gerry's upcoming memoir, "Golden Years" ... and he writes that after announcing his divorce just 3 months in last year, the negative reaction got so brutal he hit rock bottom ... writing, "One night, while I was lying in bed and staring at the ceiling, it all became too much, and for the briefest moment, I thought about putting a gun to my head."

In the excerpt, Gerry explains he’s always had a "marathon mentality" -- pushing through pain knowing it would pass. But he admitted that at the time, the agony felt endless.

Jennifer Aniston is letting the world know she's in love ... posting a romantic pic with her new boyfriend, Jim Curtis.

The actress took to IG Sunday night ... sharing a black-and-white shot of the two smiling as she wraps her arms around him.

Aniston captions the photo ... "Happy birthday my love. Cherished ❤️"

Diplo says he kissed Katy Perry's guy and he kinda liked it ... claiming he dated both Perry and former Canadian Prime Minister Justin Trudeau -- though it seems like he might be just pulling everyone's leg.

The DJ made an appearance on the "Smart Girl Dumb Questions" podcast last month ... when they talked about how "horny" of a province Quebec is -- a pretty wild convo that gets into how attractive the current prime minister, Mark Carney, is.

Diplo mentions how Trudeau is now dating Perry -- whom he dated back in 2014 ... before adding he dated Trudeau, too.

Chrishell Stause is trying to make the sun go down on the drama surrounding her lack of invite to the "Selling Sunset" premiere ... telling a photog it's really not a big deal to her.

Paps caught up with the reality star Saturday ... and they asked her about being excluded -- along with Chelsea Lazkani -- from an unofficial season 9 premiere party fellow castmate Bre Tiesi threw. Netflix didn't have an official release party for the season.

Stause says it's "all good" ... adding she couldn't go anyway because she was in New York City making an appearance on Andy Cohen's 'Watch What Happens Live.'

9:52 AM PT -- A source who was near Sydney Sweeney's house when she got out of the car heard her scream ... "I don't believe you. Please leave, leave me alone."

Short story ... this seemed anything but a reconciliation.

Sydney Sweeney's night out in Los Angeles took a twist ... when she met up with her ex-fiancé right after dinner.

The "Euphoria" actress reunited with Jonathan Davino Saturday night just moments after leaving a private dinner with friends at celeb hotspot Giorgio Baldi in Santa Monica.

We're told Sydney and her pals dined in one of the restaurant's intimate back rooms, where they caught Game 7 of the World Series while sharing food and drinks.

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.

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.

Vogue UK writer Chanté Joseph -- of the viral "Is Having a Boyfriend Embarrassing Now?" article, which has blown up the internet discussing women's perspectives on dating -- tells us the men are "outraged" and "worried" ever since the ladies got a hold of her piece.

The popularized writer tells TMZ the feedback from women on her article has been nothing but praise ... but men, on the other hand, are not too fond of her words, which have sparked worry throughout the boyfriend community.

Check the clip ... Chanté dives into how the inspiration for her article came about, saying she noticed women posting and cropping out their husbands/boyfriends from their pics online. So, she decided to start asking women why this is, and she tells us the responses were so insane she had no choice but to dig more into the subject.

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!

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.

Amy Slaton was dressed like a bride on Halloween ... but it wasn't for a costume party or even trick-or-treating ... she got hitched!!!

TMZ obtained photos from Amy's Friday wedding ceremony, and the "1000-Lb. Sisters" star is posing for pictures in her wedding dress, next to her new husband, who is looking dapper in his tuxedo.

Amy and her groom were joined by friends and family for their big day ... and it looks like they had some great weather for the nuptials ... taking pics outside on a sunny afternoon.

Katy Perry's staying loyal to new boyfriend Justin Trudeau ... because she cited their relationship when a fan at her concert asked her to get married.

Check out this fun clip from KP's "Lifetimes" Tour show in Prague Thursday ... a fan in the crowd has a sign asking Katy to marry him and he's even got a ring in his hand.

Katy's response ... "No, I'm dating someone else!!!"

Angela Martini, a former Miss Universe contestant from Albania, is back on the market ... because she just pulled the plug on her marriage.

The model beelined it to court Thursday and filed to divorce her husband Drago Savulescu after 7 years of marriage ... according to legal docs obtained by TMZ.

In the docs, Angela lists October 24 as the date of separation and she's going with the boilerplate "irreconcilable differences" as the reason for the split.

Nick Cannon says the sun hasn't gone down on his partnership with "Selling Sunset" star Bre Tiesi ... telling us the two are still going strong these days!

We caught up with the rapper and actor outside the Season 9 premiere party for the hit reality show Wednesday night ... and we asked him about his relationship status with the model and real estate agent.

Cannon says the two are always going to be together ... adding she's family, so they'll always have that link. Cannon and Tiesi have a 2-year-old son, Legendary Love, together.

Yvette Nicole Brown says young women should care about the size of a guy's heart instead of his bank account ... while encouraging them to revisit some of those dudes they may have written off as just friends.

We caught up with the "Community" star at an event for Lifetime's "Love of a Lifetime" slate ... an upcoming series of films airing on the channel all about love -- including Toni Braxton’s "He Wasn’t Man Enough," which stars Brown -- and we asked her about dating advice in today's modern world.

Brown says she fears young people are too obsessed with checking boxes off their "lists" which are focused on surface-level traits -- money, height, for example -- instead of the stuff that really matters ... like kindness.