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10:55 AM PT -- Law enforcement sources tell TMZ ... Michelle Trachtenberg’s body may have rejected the liver transplant she received within the last year, causing complications. We're told Michelle's mother found her.

Michelle Trachtenberg, known for her roles in "Gossip Girl" and "Buffy the Vampire Slayer," has died.

Police sources confirmed the shocking news to TMZ, though the exact cause of her death remains unclear. We're told police and paramedics responded to a call for a woman in cardiac arrest, and found Michelle unresponsive. She was pronounced dead on the scene.

A separate source tells us the actress had received a liver transplant recently ... meaning within the last year. At this point, police reportedly believe she died of natural causes.

We're told Michelle was out with friends Thursday night of last week at Sartiano's in NYC.

In recent months, she had posted photos where fans felt she appeared gaunt and frail.

Blake Lively's remembering her former costar Michelle Trachtenberg ... saying she always gave 200% effort and she always stood up for what she believed in.

The actress took to Instagram just hours after it was announced that Michelle had passed to pay homage to the star ... sharing a photo of their first day meeting and talking about her former "Gossip Girl" costar.

Blake says she brought an electricity to every room she walked into ... always living life to the fullest -- laughing hard at jokes, taking on authority head-on when she saw injustice and added she was proud to be an actor even when the industry can be difficult.

Loni Love's side-eying MSNBC's recent personnel decisions ... claiming they look a little suspicious -- and possibly even racially motivated.

We caught up with the comedian and talk show host in Los Angeles Tuesday ... and, we asked her if she had any thoughts about MSNBC anchor Joy Reid leaving the liberal media outlet.

Loni says she's outraged, not only for Joy, but all people of color who have been affected by the cable channel's recent staffing choices.

Jay Leno is responding to Monica Lewinsky’s claims that he went especially hard on her after her affair with Bill Clinton hit the headlines in the '90s.

Sources close to Jay tell TMZ he didn’t target Monica personally back then -- he says she was just an easy punchline and fair game, since she was everywhere in the news at the time.

Addressing Monica's claims from Tuesday's "Call Her Daddy" interview with Alex Cooper, sources say Jay wouldn’t call it unfair -- she was often the butt of the jokes, but no one was out to get her personally. It's just that, in comedy, sometimes people get hurt.

Michelle Trachtenberg’s untimely death at 39 has sent shockwaves through her fans and colleagues -- and her former "Gossip Girl" costar Ed Westwick has posted a tribute to the star.

In a heartfelt post on his IG Story Wednesday, Ed shared a pic of Michelle as Georgina Sparks from the popular teen drama series ... captioning it, "So sad to hear of the passing of @michelletrachtenberg."

He added "sending prayers" with the prayer hand and a white heart emoji.

Matthew Perry's final days were flooded with ketamine -- 27 doses in the three days before his tragic death in October 2023, a bombshell new documentary has revealed.

Peacock's "Matthew Perry: A Hollywood Tragedy" was released Tuesday, with U.S. Attorney Martin Estrada -- who led the investigation -- pointing fingers at the people who allegedly supplied Perry with the powerful anesthetic.

According to Estrada, these weren't just medical professionals -- they were opportunists who "should have known much better."

Sha'Vi Lewis, a reality star featured on "Project Runway" died on Monday ... TMZ has confirmed.

Sha'Vi's sister, Akira tells TMZ ... "We are in a state of disbelief as we come to the reality that our star has been caste into eternity. As the days move forward we will continue to wrap our minds around a future without your presence."

She adds of her brother, who starred on Season 18 of the Bravo show ... "While the world is just catching on to the name Sha'vi we knew he was and is great! Continue to pray as we mourn the loss of our loved one, Franklin Shavi Lewis Frierson Jr."

Maitland Ward is spilling the beans on her clash with "Boy Meets World" costar Danielle Fishel now that she’s caught her breath -- and she's telling us she definitely didn’t expect to be cornered like that!

The actress-turned-adult entertainer opened up to TMZ, saying the heated "Pod Meets World" episode wasn’t about DF wanting to truly mend their estrangement, but more about wanting to "give it to her" -- so much so, Maitland says it felt like she suddenly morphed into villainous Regina George.

Catch the video, 'cause Maitland doesn't hold back -- she makes it crystal clear she wasn’t buying any of Danielle’s excuses, like "accidentally" unfriending her on Facebook and leaving her message unread for years.

Jon Stewart is bleeding for his art, or in this case his anger, over Elon Musk's DOGE cuts to government spending -- dude actually sliced his hand open during a 'Daily Show' rant.

During Monday night's episode, Jon was going off about Musk laying off thousands of government employees, and suggested -- scratch that -- STRONGLY suggested DOGE should be taking aim at the government's deals with the huge corporations of Big Pharma.

JS worked himself into a rage, grabbed a "World's Most Dad" mug he had on the desk and smashed it to smithereens! Great visual to drive home his point, but it also left him bleeding out.

Celebs kicked off the festivities following the Screen Actors Guild Awards ceremony Sunday night, gathering for the official after-party at the Shrine Auditorium, and cameras were there to capture all the high-powered wattage.

The talent mingled at the official Post-Awards Gala, hosted by People and Audi, to get their awards engraved and generally rub elbows with this year's winners.

Molly Shannon and Selena Gomez shared a laugh, Zoe Saldana struck an elegant pose, Ralph Fiennes and Timothée Chalamet got chummy, and Kieran Culkin got serious for a sec ... after previously quipping onstage how heavy the statuette was.

The most star-studded union in the world showed their style solidarity Sunday ... with card carrying SAG members lookin' real fashionable at this year's Screen Actors Guild Awards!

Kristen Bell didn't look nervous to host the show whatsoever on the red carpet ... sharing a small smile in her layered multicolored mesh ensemble. Selena Gomez pulled off a more monochromatic look -- stunning in navy blue dress. Meanwhile, Ariana Grande channeled Glinda in a frilly pink gown.

TV star Kerry Washington channeled the silver screen in her silver dress ... taking the 'little fires everywhere' and bringing the heat to the red carpet.

Tony Raines -- an MTV reality TV star -- was arrested early Sunday morning for operating a vehicle while intoxicated ... TMZ has learned.

Raines -- a contestant on "The Challenge" and "Real World: Skeletons" -- was arrested on 1 count of operating a vehicle while intoxicated, 1 count of reckless operation and four counts of negligent injuring.

It's unclear exactly what led to his arrest ... but, sources tell us Raines was at a  wedding in Hammond, Louisiana on Saturday night and he went to the afterparty at a nearby restaurant after.

Teddi Mellencamp's turning a corner for the better, and her most recent health update looks promising ... this according to Dr. Terry and Heather Dubrow.

We caught up with reality TV couple in L.A. Friday night, and we asked about how Mellencamp's doing -- Heather and Teddi have both starred on 'Real Housewives' series, so they run in similar circles -- and, Heather says they got a good update this week.

Heather and Terry won't share what exactly the good news is ... but, they say it means Teddi's turning a corner -- and, doing a lot better than when she was initially told she had multiple tumors on her brain.

Lynne Marie Stewart, the actress best known for her roles in "American Graffiti,"  "Pee-wee’s Playhouse" and "It’s Always Sunny in Philadelphia," has died, TMZ has confirmed.

Bette Smith, Stewart's manager tells TMZ ... the actress died unexpectedly yesterday afternoon at her sister's California home. In December, doctors found a tumor between the liver and gall bladder. Prior to the diagnosis, Stewart wrapped Ben Stiller's upcoming film "The Dink" ... as well as kept working on "It's Always Sunny in Philadelphia."

"She was the most talented and funny and most honorable person I have ever known," Smith told us of Stewart.

Porsha Williams' estranged husband has been detained by U.S. Immigration and Customs Enforcement amid their bitter divorce ... and the 'Real Housewives of Atlanta' star calls the situation "disheartening."

Simon Guobadia, a Nigerian philanthropist, is being held at Stewart Detention Center in Lumpkin, Georgia, per U.S. Department of Homeland Security records.

Not long after the news started to make headlines, Porsha addressed the situation via an IG statement ... "It's disheartening to see my estranged husband make choices that have led to this outcome. At this moment my priority is moving forward with my family. 🙏🏾."

Eva Marcille is enjoying her acting career detour from TV to the stage, and has no idea if she'll return to "The Real Housewives of Atlanta" ... but she'll be tuned-in to next season!!!

TMZ caught up with Eva in Beverly Hills as she soaked up the city ahead of her two-day live presentation of "Jason's Lyric."

Eva plays Lyric, originally portrayed by Jada Pinkett Smith in the 1994 flick ... and she's dubbing the play an important relic for Black History Month.