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Katie Thurston's sharing a major life update ... telling her fans she's been diagnosed with breast cancer -- and, she plans to share every bit of it.

The 'Bachelorette' star shared the news in an Instagram post Saturday morning ... telling fans she and her fiancé, comedian Jeff Arcuri, planned to travel the world before settling in NYC -- but, they had to cut it short so she could deal with getting medical coverage for her illness.

She says her recent life has run her through a gauntlet of emotions ... from anger, sadness to denial -- before she emerged on the other side ready to fight cancer.

'SNL 50' put on a concert for the ages Friday night in NYC ... as several superstar musicians and former cast joined forces to celebrate 'Saturday Night Live's half-century milestone!

Miley Cyrus, Lady Gaga, Will Ferrell, Jimmy Fallon and Bill Murray were some of the highlights in the packed" SNL 50: The Homecoming Concert" show ... which also featured performances by Bonnie Raitt and Chris Martin, Arcade Fire, David Byrne, St. Vincent and the Preservation Hall Jazz Band and Post Malone.

Miley worked the stage — and the audience — as the three-time Grammy winner performing at Radio City Music Hall early into the multi-hour celebratory event. MC belted Queen's "Crazy Little Thing Called Love" with Brittany Howard, as well as her Grammy-winning hit, "Flowers."

John Goodman is part of the fabric of "Saturday Night Live" but he's going to be MIA from the big 50th anniversary special ... and now we know why.

Sources close to John tell TMZ ... he was invited to participate in 'SNL 50' this weekend but he is missing the reunion because of prior work commitments.

We're told John is across the pond filming an Alejandro G. Iñárritu movie with Tom Cruise and can not break from production to travel back to New York City for 'SNL 50.'

Comedian Jeff Dye's taking a blowtorch to Sarah Hyland's family-friendly image -- 'cause he says the sitcom star's the worst -- and, he went out of his way to ruin her big moment on a movie set.

Dye sat down for an interview on "The George Janko Show" ... and, he talked about his time on "The Wedding Year" -- a 2019 rom-com starring Hyland, Tyler James Williams, Jenna Dewan and Anna Camp.

In the movie, Dye plays Camp's character's husband ... a role he says landed him on set for all of 30 seconds -- long enough to see Sarah's worst parts, Jeff claims.

Steve Martin is gearing up for one of the biggest performances of his career for the 'SNL' 50th anniversary special ... and he's doing it alongside some of his famous friends.

Steve turned heads on Thursday night at the legendary Comedy Cellar in NYC, when he spontaneously took the stage to workshop material. Sources with knowledge tell us his jokes are in preparation for the massive 'SNL' show this upcoming Sunday.

We're told 'SNL' legends Martin Short and John Mulaney joined Steve onstage and participated in his bit.

Leslie Charleson -- the soap opera legend who appeared in more than 2,000 episodes of "General Hospital" -- died from blunt head trauma ... though, it appears the injury didn't happen recently.

According to documents, obtained by TMZ ... Charleson died from "sequelae of blunt head trauma" -- basically the long-term effects of a head injury she suffered.

It's unclear when she sustained the injury ... though we do know several falls in recent years prevented her from appearing on "General Hospital."

"Saturday Night Live" is gearing up for its epic 50th anniversary, and it's shaping up to be a spectacular episode ... 'cause a bunch of superstars were spotted rolling in for rehearsals.

The guest list is insane -- we’re talking Wyclef Jean, Nick Carter ... and Cher herself!

The whole Backstreet Boys crew showed up Wednesday night in NYC, with Kevin Richardson and Howie Dorough bringing that Larger Than Life energy to the party. Check out the gallery with last night's arrivals!

Teddi Mellencamp's brain is covered in tumors ... and, doctors are working quickly to remove the biggest ones, she revealed Wednesday.

The reality television star shared the news in a simple black-and-white text post ... telling her millions of followers she's been out of commission the last few weeks due to a series of debilitating headaches.

Mellencamp was fighting through them until Tuesday, she says ... when the pain forced her to go to the hospital. Doctors then administered a CT scan and an MRI -- and, Teddi says they found multiple tumors on her brain, which her doctors think have been growing for months.

Kim Kardashian is getting married again!!! Okay, not exactly … but her character on Ryan Murphy’s new legal drama "All’s Fair" seems to be getting hitched.

Check it out … Kim was spotted Tuesday on a beach in Malibu filming her "I do's" with her co-star and new TV hubby, model Matthew Noszka.

Matthew -- along with Glenn Close, Sarah Paulson, Naomi Watts, and Niecy Nash -- all star in the new Murphy drama ... and from what we’ve seen so far, it’s shaping up to be a hot, tense show!

Here’s something that'll turn your world Upside Down -- pics of Joe Keery shirtless at the beach!

The "Stranger Things" star traded Hawkins for some Aussie sunshine, living his best beach life soaking up the rays and having a blast with his friends in Sydney.

Joe made the most of his downtime, whipping off his top and taking a dip in the ocean to give that famous Steve Harrington hairdo a little wet-n-go treatment.

O.J. Simpson really killed it with the ladies ... with former "Saturday Night Live" star Laraine Newman revealing The Juice was a "good kisser."

Laraine did some kissing and telling Tuesday night on 'Watch What Happens Live' ... telling host Andy Cohen about her fond memories of O.J.

A bunch of 'SNL' alums -- Rachel Dratch, Ana Gasteyer, Cheri Oteri and Cecily Strong -- were being asked if athletes made good 'SNL' hosts when Andy asked the women if they were on the NBC sketch comedy show back in the day when O.J. hosted.

Wendy Williams can relate to hardcore criminals -- not that she's committed a crime -- but her life mirrors someone confined to a jail cell.

TMZ has dropped a documentary on Tubi, "TMZ Presents: Saving Wendy" ... which explores her guardianship which has now gone on for years. As she says, her life is isolated. She's in a New York City assisted living facility, where she is confined to a room on the 5th floor.

Wendy cannot leave the floor without permission from the staff. She says she's been outside in the fresh air twice in the last 30 days ... both times for dentist appointments.

Greg Germann, best known for "Ally McBeal," has filed for divorce after 12 years of marriage, TMZ has learned.

According to legal docs obtained by TMZ, the actor filed for divorce from his wife Martha Champlin Tuesday, citing their date of separation as March 3, 2024.

Germann cited "irreconcilable differences" as the reason for their split, and is asking the court to nix any spousal support payments to her.

Arnold Schwarzenegger is proving the apple doesn't fall far from the tree, showing love for his son, Patrick, on the red carpet at "The White Lotus" premiere.

Patrick stars in the new season of the HBO hit series, set in Thailand this year, and invited his star-studded family to celebrate the show’s third season premiere at Paramount Studios on Monday night.

His fiancé, Abby Champion, joined him along with parents Arnold and Maria Shriver, and his sister Katherine. His brother-in-law and box office star Chris Pratt was also in attendance.

Chris Candy has a pretty good feeling about how his legendary dad, John Candy, would’ve reacted to his Dunkin' Super Bowl ad cameo ... and he clued TMZ in.

The late comedy star was also a die-hard football fan -- even co-owning the Toronto Argonauts -- so Chris tells TMZ his father would’ve been immensely proud and blown away by his part in the star-studded commercial during the big game.

Chris admits he had no idea he’d booked a Super Bowl commercial -- only weeks later, after production kept getting delayed by wildfires, did he realize how huge it was when he finally showed up on set ... and stars were all over the place, including Ben Affleck, who also directed the spot.

Kanye West pulled some very expensive, very antisemitic wool over the eyes of FOX when he purchased his Super Bowl Sunday TV ad ... TMZ has learned.

The 30-second spot, which Kanye says he shot on his iPhone, shocked a lot of viewers ... seeing as how the rapper had just gone on a horrible antisemitic rant -- flatly declaring on Friday, "I'm a Nazi."

Sources with direct knowledge tell us FOX actually approved the ad Friday to air Sunday in 3 markets -- L.A., Philly and Atlanta -- but that process was purely based on 2 things ... the content of the ad, and the website it was promoting, yeezy.com.