TMZ.com

Taylor Swift gave Dave Portnoy a big surprise this weekend -- a letter penned by the pop superstar thanking him for all of his support.

Portnoy -- the self-proclaimed "king of the Swifties" -- received the handwritten letter from Taylor's brother, Austin, who personally delivered it to the Barstool Sports owner before he attended the singer's "Eras" tour concert in Miami on Saturday.

Portnoy was so excited, his "BFFs" podcast posted the letter Sunday on Instagram with a caption that read,  “What a gift from @taylorswift to @stoolpresidente at last night’s Eras Tour.

Justin Bieber getting back onstage ... performing alongside pal Don Toliver -- all while his wife Hailey supported him from the crowd.

The pop star took the stage during DT's L.A. show Saturday night ... singing and dancing. There were some cheers in the crowd, and lots of cameras filming the star who doesn't perform nearly as much as he used to.

Videos posted to IG by Hailey also capture her reaction to her man gettin' back onstage ... dancing to Toliver's tracks while seated pretty far from the stage in what appears to be some sort of VIP area.

Rock & Roll Hall of Fame inductions aren't just about music anymore -- as greats like Cher, Mary J. Blige, Dave Matthews and Ozzy Osbourne entered the Hall ... A-list super fans and racy outfits were also front and center.

The ceremony went down Saturday night in Cleveland at Rocket Mortgage Fieldhouse -- and Cher's iconic hit, "Believe" kicked things off, as she performed it with Dua Lipa.

When it came time to induct Cher, Zendaya did the honors while rocking a barely-there gown that looked like she borrowed it directly from Cher's closet.

Pink fans in the Midwest are sure to be a little disappointed ... 'cause she just postponed a few shows out there -- a decision she says it out of her hands.

The singer-songwriter posted to Instagram Saturday morning ... telling ticketholders in Nebraska, South Dakota, Wisconsin and Iowa she's gotta put off the shows she planned in their states.

Pink doesn't explain why she's can't perform on the scheduled dates ... chalking it up to "reasons beyond my control."

Madonna attended a packed show at Madison Square Garden this week ... no, it wasn't her own -- it was Billie Eilish's instead!

The legendary pop star stopped by the legendary New York City venue with her boyfriend Akeem Morris to watch Billie and her brother Finneas put on their show.

No special VIP tickets for the Queen of Pop BTW ... looks like she's in the crowd like everyone else -- jamming out and chattin' in her man's ear.

Zayn Malik's still reeling from Liam Payne's death ... announcing moments ago he's postponing his "Stairway to the Sky" tour after the "heartbreaking loss" this week.

The singer-songwriter posted a short message to his Instagram story ... telling fans he needs to push off the U.S. leg of his tour -- and, he's rescheduling for January.

ZM says he plans to post the updated dates in the coming days ... and, he's thanking fans for their compassion and understanding during this time.

Liam Payne stayed in one other hotel before checking into the one where he died, and did party pretty hard while there -- but, despite reports, it wasn't enough to get him kicked out of the fancy spot.

Liam and his girlfriend Kate Cassidy were staying at the Palacio Duhau Park Hyatt in Buenos Aires during the week prior to his death, and a staffer there tells TMZ ... the couple was definitely in celebratory vacay mode.

We're told Liam did get "pretty drunk" on some nights, but he was never belligerent. In fact, he was, at least, trying to be entertaining ... as he would sometimes sing in the lobby.

Shawn Mendes was so overcome with emotion over the death of Liam Payne ... the singer paused his NYC concert Friday night to pay tribute to his pal.

Shawn was performing at the Brooklyn Paramount Theatre when he took a moment to tell the crowd that the One Direction star was a "beautiful soul" ... and the shocking news of his death was "devastating."

SM emotionally lamented ... “Liam, we love you. The world is crying for you, brother. And we’re all praying for your son and your family, and I miss you, man. So this one’s for you tonight, Liam, from all of us.”

Liam Payne's sister has broken her silence after the tragic death of the One Direction star ... and her message is absolutely devastating.

Ruth Gibbins posted a lengthy statement to her Instagram page along with several sweet photos of the siblings -- all to express how much she loved her brother and her unbearable pain, which included, "I'm sorry I couldn't save you."

She began with, "I don't believe this is happening. Many times have I poured my heart out publicly with pride about Liam but never much about life as his sister ... Liam is my best friend."

Taylor Swift's final leg of her epic "Eras" tour is off and running after after a two-month hiatus -- and the Miami concert drew some major celebs.

Taylor swooped in to perform at the Hard Rock Stadium, with the likes of retired NFL star Tom Brady, tennis great Serena Williams and "Today" cohosts Hoda Kotb and Savannah Guthrie all enjoying the show.

Just before the gig, Tom posted a photo with his 2 sons, Jack and Benjamin — and the happy trio was all smiles. Tom wrote in the caption, "Boys night at the Eras Tour."

7:40 PM PT -- Although police say Liam's behavior sounds consistent with that of "cristal" users, they still don't know if that drug was present in the room. We're told they're still waiting for test results on the narcotics and medications they recovered.

Liam Payne was potentially under the influence of a potent drug, known to cause psychotic attacks and hallucinations, when he died ... according to police in Argentina.

Cops in Buenos Aires tell TMZ ... their operating theory is Liam was high on a substance called "cristal," which police say causes users to experience extreme highs and extreme lows, often making them aggressive.

Photos from inside Liam's hotel room show the place trashed ... his TV was smashed and there was drug paraphernalia in the room, which was littered with broken objects.

Travis Kelce can't be at Taylor Swift's show tonight because of his NFL season,  but his family's showing love for his girlfriend .... hitting up the "Eras" tour in Miami.

Travis' brother, Jason Kelce, is at Taylor's Friday concert ... along with his wife, Kylie, and their daughter, Wyatt.

The family of three was spotted heading into Hard Rock Stadium ... and Travis' mother, Donna, was spotted inside the venue -- her very first "Eras" experience -- so there are at least 4 Kelces there.

Liam Payne's father is sharing his grief with his son's fans in Argentina ... standing with them in an incredibly poignant moment right outside the hotel where Liam died.

The heartbreaking scene played out Friday evening in Buenos Aires ... Geoff Payne solemnly walked around the makeshift memorial fans have created on the sidewalk in front of the CasaSur Palermo hotel.

As Liam's dad looked at all the flowers, letters and candles ... fans observed a moment of silence in honor of the singer.

Liam Payne was seemingly in a good place with his sobriety months before his tragic death in Buenos Aires ... TMZ has learned.

Sources with direct knowledge tell TMZ ... the One Direction alum was very vocal about being sober in the late spring/early summer of 2024 ... telling people in his inner circle working with him that he was on the wagon.

We're told those around him saw no warning signs of either drug or alcohol abuse at the time.

Kamala Harris campaign staffers got a pep talk from a surprise celebrity guest ... pop star Katy Perry!!!

Sources with direct knowledge tell TMZ ... the Harris campaign staff met Friday for one of their regular all-staff Zoom calls, when the campaign's chief of staff suddenly announced she wanted to introduce a special guest who is a huge supporter of Harris and a friend of the Vice President.

Katy then appeared on the screen ... and cheered on Harris campaign staffers.

Corey Feldman is all in favor of Diddy’s arrest and federal indictment, saying he hopes it leads to more "scumbags" like the music mogul getting taken down too.

A photog caught up with Corey in Bev Hills, where he made it clear he never attended any of Diddy’s infamous parties, joking he was probably too old to get an invite -- a reference to Diddy facing sexual abuse claims from multiple alleged victims who say they were minors at the time of their alleged abuse.

Corey says he's thankful justice is being served, calling the whole situation gross and emphasizing that children need protection. You really need to catch the full clip to see just how disgusted he is about the whole thing.