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Taylor Swift took over New Orleans Saturday night, with an assist from Sabrina Carpenter.

T.S. hit the stage at the Caesars Superdome for her "Eras" tour and performed a slew of hits when she grabbed a cell phone in front of 65,000 screaming fans and gave Sabrina a jingle ... then summoning her to the stage.

Sabrina obliged and she and Tay sang a duet, which made the crowd go even more insane.

Adele had a tearful interlude at her Vegas residency Saturday night ... when she spotted a fan in the audience ... and that would be Celine Dion.

Adele was singing "When We Were Young" at a packed arena at the Colosseum at Caesars, when she eyeballed the famous Canadian in the crowd.

Adele beelined it over to the "My Heart Will Go On" singer ... the 2 embraced as Celine clasped Adele's face. Tears flowed and Kleenex appeared.

Taylor Swift took a moment during her "Eras" tour concert in New Orleans Friday night at Caesars Superdome ... to share some love with her devoted fans.

Saying she was deeply touched that her fans have "created traditions" amid a "mass movement of joy" ... TS noted she was in awe of how iconic friendship bracelets had become among them.

“I just showed up one day and you guys were trading friendship bracelets ... and I was like ‘that’s cool’ and now there is a giant friendship bracelet on the outside of this stadium."

11:00 AM PT -- A source with direct knowledge tells us Chappell Roan yelled at the photographer on Friday because the same person pissed her off at a different event with alleged obnoxious behavior ... and CR remembered.

The photog did offer an apology ... but it's not clear if it was accepted.

We're told it is NOT the same photog who pissed her off in September on the red carpet at the MTV Video Music Awards, as you'll recall.

Chappell Roan can't escape all the drama in her life .... or the paparazzi!!!

Singer Loomis is giving insight into her botched take on the National Anthem ... defending she's actually a good singer, despite her poor performance.

We caught up with artist in Los Angeles Friday, after she asked to "go back" and start again while singing the U.S. anthem during the Free and Equal Elections Presidential Debate Wednesday.

However, Loomis defended that her nerves and her confusion about how the event was being broadcast caused her to make her impromptu request mid-song.

Madonna knows the "Power of Saying Goodbye" … visiting the gravesite of her late brother, Christopher Ciccone, after his death earlier this month.

Madonna documented her poignant visit to her late sibling’s grave – which is located in their home state of Michigan – by posting a number of intimate photos to her Instagram Stories Friday.

The Material Girl wasn’t alone on the trip to Christopher’s headstone, which she dubbed a “homecoming," as her daughter, Lourdes Leon, was by her side.

Phil Lesh, co-founder and bassist for The Grateful Dead, has died ... his official Instagram account announced Friday.

According to the update, Phil, who worked closely with late frontman Jerry Garcia for 3 decades, passed away "peacefully" Friday morning surrounded by his family.

The statement continued ... "Phil brought immense joy to everyone around him and leaves behind a legacy of music and love. We request that you respect the Lesh family’s privacy at this time."

Step aside, Fergie ... up-and-coming singer Loomis is the latest person to totally butcher the National Anthem, and the flub is super toe-curling, to say the least.

As you can see, the singer starts off strong at the Free and Equal Elections Presidential Debate on Thursday ... but quickly goes off-key, losing her cool and begging into the mic, "I f***ed it up, I f***ed it up. Can I go back, can I go back please?"

As if that weren't enough, a cameraman chimes in to let her know she’s live -- and she’s horrified, trying to soldier on ... but her cracking voice gets worse.

Paris Hilton is sliving after performing a 17-song set at the Hollywood Palladium ... saying as much during an intimate meet and greet with fans after her epic show.

Check it out ... the heiress-turned-DJ took time on Thursday evening to chat with a group of VIP fans, all of whom gush about her performance while posing for pictures with the reality TV legend.

Paris was equally giddy during the exchange, confessing the evening was the "most iconic" of her life ... which is certainly saying something given her social calendar to date.

Nicole Scherzinger stayed friends with Liam Payne right up until his death ... with one of her Broadway colleagues revealing the two texted on the day he died.

Andrew Lloyd Webber -- famed composer of some of the biggest Broadway shows ever -- sat down for an interview with Billboard to talk about the "Sunset Boulevard" revival running on Broadway. Nicole stars in the show, and Andrew touted her for her composure.

Lloyd Webber says a chief example of this came on the day Liam passed ... saying Liam and Nicole were sending messages back and forth in the afternoon. She found out he passed just before the show -- but, still went out and put on a great performance for reviewers.

One small item found in Liam Payne's hotel room is getting a lot of attention from cops investigating his death, because it might unlock the mystery of who helped him score drugs ... TMZ has learned.

Law enforcement sources in Buenos Aires tell us ... authorities are now investigating the possibility a hotel employee delivered drugs to Liam, which has them focusing on a Dove soap box found in the room, and seen very clearly in a photograph taken after Liam's deadly fall.

The box was on the same table where cops also found drugs and paraphernalia -- tinfoil used to ingest drugs, as well as white powder.

Taylor Swift's about to get a larger-than-life "Eras" tour welcome ... 'cause New Orleans has dressed up the Caesars Superdome with some totally on-brand vibes.

The Big Easy venue's been blinged out with a giant friendship bracelet to greet Taylor before she kicks off her 3-night concert takeover of the town Friday.

It's definitely one heck of a personal touch that really amps up the excitement from both fans and the city to welcome Tay Tay.

Police in Argentina are moving full steam ahead in the Liam Payne death investigation ... raiding the hotel where the former One Direction singer plunged to his death.

Law enforcement sources tell TMZ ... cops in Buenos Aires showed up at the CasaSur Palermo Hotel Wednesday night to review electronic and paper records following the October 16 tragedy in which Liam fell from the third-floor balcony of his room into a courtyard.

Our sources say Liam's initial autopsy results revealed he had "pink cocaine" in his system, a dangerous cocktail of various drugs such as meth, ecstasy and ketamine, as well as other narcotics.

Matty Healy may have some "Bad Blood" with Taylor Swift and her fans after one eyebrow-raising interview ... in which he seemingly took a dig at the pop star and their "casual" fling.

The 1975 frontman opened up about his upcoming music during a recent appearance on the "Doomscroll Podcast" ... and hinted he wouldn't be reliving his whirlwind romance with Taylor in the tunes.

Check out the clip ... While Matty never named Taylor directly in the interview, he did address how he became "a way more well-known public figure" lately ... but the British singer noted he's "just not interested" in writing about his "casual romantic liaisons."

Celine Dion hit the stage and dished out a big dose of hope in her first stage appearance since the Paris Olympics this summer.

The singer looked incredible as she delivered a powerful speech at the Music, Film and Entertainment Industry Spirit of Life Gala Tuesday night, applauding the philanthropic org City of Hope for providing support and encouragement to those facing life's toughest challenges.

Celine acknowledged that it was such a joy to come together with everyone in the room to do everything in her power to "help spread this great gift of hope."

11:45 AM PT -- A representative for the Royal Bahamas Defense Force confirmed to TMZ ... The 66-year-old woman jumped from the 14th floor of the cruise ship. Search and rescue efforts were officially called off Wednesday.

The Taylor Swift-themed cruise from Florida to the Bahamas went from happy to sad Tuesday ... as a 66-year-old woman fell overboard and is now missing.

A rep for the U.S. Coast Guard tells TMZ ... the Royal Caribbean cruise ship filled with Taylor's "Swifties" left the Port of Miami Monday and was about 17 miles north of Nassau in the Bahamas when tragedy struck Tuesday night.

According to the spokesperson ... the woman tumbled off the ship called Allure of the Seas, plunging into the ocean at about 9:40 PM.