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Taylor Swift fans are nothing if not committed, and with her new album dropping Friday ... they're going all out to scoop up every little detail they can, including at pop-ups.

Swifties were out in full force Tuesday to catch a glimpse of a temporary art installation at the Grove in Los Angeles, which offered a promise to give some insight into her new album -- and as you might imagine, massive lines were literally snaking around the block.

Even though details were hazy about what exactly the pop-up entails, some fans reportedly started lining up as early as 5 AM -- all just to get a glimpse of this makeshift bookshelf thing that was standing in the middle of the shopping center ... which was all Taylor-themed.

'80s hitmaker Kenny Loggins is peeling back another layer on the legendary recording of "We Are the World" -- revealing how he scored his pal Huey Lewis a solo when Prince bowed out.

Kenny spilled the tea on a recent episode of Huey Lewis' Apple Music show, as both artists were talking about "The Greatest Night in Pop" ... the Netflix documentary about the making of the 1985 charity record.

Huey says the doc helped him piece together lots of details about the recording ... including the fact Kenny was the one who suggested Huey sing the line originally intended for the "Purple Rain" singer.

Katy Perry says Jelly Roll would make a good 'American Idol' replacement before she dips -- this as the question of who's gonna fill her shoes continues to linger.

The singer told E! News she's all in for the rapper/country star to take her spot next season -- especially since he made a lasting impression on her during his guest appearance on the ABC show earlier this month.

She says "I gotta say, Jelly Roll was crazy when he came on the show" ... adding he had her totally convinced with all his industry knowledge.

Courtney Love ain't showin' much love for Taylor Swift -- in fact, she's got some harsh words for her ... not to mention for Beyoncé and a lot of other ladies in the modern pop space.

The alternative rocker made her controversial remarks in a recent interview with The Standard, first zeroing in on Taylor by calling her "not important." Love accused Taylor of being a "safe space for girls" and the Madonna of this generation.

She then ends her thoughts by saying T-Swift is "not interesting as an artist."

Coachella kicked off its first weekend on a high note ... managing to rack up a grand total of $0 in curfew fines, which seems to line up with how many tickets were still up for grabs.

A rep for the City of Indio -- where Coachella takes place -- tells TMZ ... no curfew rules were broken during the first installment of the festival, and everyone stuck to the 1 AM curfew for Friday and Saturday ... while shutting things down by midnight on Sunday.

In other words ... there was no reason to fine anyone for going over on time -- and considering the lackluster response to this year's lineup ... we suppose that makes sense.

Justin Bieber's giving his fans what they want -- if just for a brief moment ... as he got back on a stage to perform live, joining Tems for her Coachella set.

JB hit the stage with WizKid Sunday night at the California music festival, performing their hit song, "Essence" for the excited crowd. Check it out ... the audience goes totally nuts as Justin appears onstage in a black sweatshirt, cargo pants and a baseball hat.

Justin's cameo was a welcome surprise ... as the singer has been keeping a low profile following his Ramsay Hunt Syndrome diagnosis.

Billie Eilish is leaning into the fact that she's into girls -- planting a kiss on a female YouTuber at Coachella ... and smacking the gal's ass while she's at it.

The singer was filmed at the music fest this weekend, where she smooched with Quenlin Blackwell -- a Gen Z content creator who's been hanging out with BE a lot lately ... and with whom she's sparking romance rumors after this PDA moment.

Watch ... Billie could be seen grabbing Quenlin's face and pulling her in for a kiss while enjoying music at the festival. It wasn't super show-y or anything ... still, a kiss is a kiss.

11:22 AM PT -- A rep for CBS tells TMZ ... "A network programming timing error ended last night's Billy Joel special approximately two minutes early in the Eastern and Central Time Zones. We apologize to Mr. Joel, his fans, our affiliated stations, and our audience whose viewing experience was interrupted during the last song."

They add, "Due to the overwhelming demand from his legion of fans, BILLY JOEL: THE 100TH – LIVE AT MADISON SQUARE GARDEN will be rebroadcast in its entirety on CBS on April 19th at 9:00PM ET/PT."

Billy Joel and his fans got screwed during CBS' broadcast of his iconic 100th concert -- 'cause it started late, and got cut off early ... something that seriously pissed off viewers.

Will Smith made a rare appearance onstage this weekend -- crashing Coachella to perform a song from the '90s ... and doing it alongside none other than J Balvin.

Indeed ... very random, but no less entertaining. Balvin had an alien-themed design and aesthetic for his Coachella gig ... and at one point in the set, he brought out WS who was rocking his signature 'MIB' 'fit ... only to rap the "Men in Black" song from the titular movie.

The crowd loved it ... including Jada Pinkett Smith, J's girlfriend, Valentina Ferrer, and BLACKPINK sensation Lisa who were seen dancing together in the artist pit. Will's performance is getting rave reviews too, 'cause people could clearly hear his vocals as opposed to a backing track.

Colt Ford is doing a little better after suffering a heart attack -- but he's far from out of the woods, and won't be well enough to hit the stage anytime soon ... TMZ has learned.

The country singer's team confirms to TMZ that CF remains in the ICU following his medical episode ... which landed him in the hospital after a show in Arizona.

With that said, his team says Colt is steadily improving -- but it's pretty obvious he isn't doing great, because they've gone ahead and canceled the rest of his touring dates this year.

Justin Bieber and Jaden Smith are still friends after all these years ... with Jaden grippin' Justin in a big hug and gettin' a smooch in return during Coachella.

The two music superstars met up Saturday during the music festival's busy first weekend ... and, JS decided to surprise his best bro by embracing him from behind.

Check out the clip ... Bieber's face lights up when he looks back and sees it's Jaden who decides to move around and go for a real embrace from JB in a VIP area at the festival.

Grimes' Coachella performance didn't go as planned ... plagued by constant stoppages she blamed on technical difficulties -- before she let off several frustrated shrieks.

The singer-songwriter took the stage on Saturday night out in Indio, CA, presumably ready to bring the house down ... though ultimately she couldn't keep the music up.

Check out the clip ... Grmies' show on the Sahara Stage is moving along just fine before an incorrectly timed transition throws the musician into a bit of a tailspin.

Taylor Swift and Travis Kelce couldn't keep their hands to themselves Saturday night ... lockin' lips at Neon Carnival after engaging in some backstage PDA.

Video from inside Neon Carnival -- an invite-only rager sponsored by Liquid IV, Patron El Alto and Levi's -- shows the power couple immersed in their own little world, lips securely locked to one another.

Looks like they've both got drinks in hand at the mega-exclusive event ... though they're far more focused on using their mouths in a different way to take a swig.

Taylor Swift and Travis Kelce made a surprise appearance at Coachella Saturday night ... getting cozy backstage while showing support for Tay's Collaborators.

The couple was spotted backstage hugging and dancing while friend Jack Antonoff's band Bleachers performed.

Traylor also showed support for Tay's "Karma" collaborator Ice Spice during her Coachella performance.

Gwen Stefani and the men of No Doubt set Coachella ablaze last night ... returning to the stage together for the first time in nearly a decade.

Gwen, bassist Tony Kanal, guitarist Tom Dumont and drummer Adrian Young took the stage last night, playing a nostalgic and high-energy set ... performing their first gig together in -- as Stefani herself put it -- "nine f***ing years!"

The band performed an 80-minute set and fans ate it up ... calling the reunion "iconic" and "one of the best performances of the year" on social media.

Morgan Wallen's squashing rumors he's feuding with his ex, KT Smith ... hangin' out with Smith and their son Indigo in the first photos taken since his arrest.

The singer-songwriter stepped out in Nashville in a casual outfit ... t-shirt and jeans just days after cops arrested him for allegedly tossing a chair off the roof of a popular Nashville bar.

KT's also dressed in a causal outfit ... great for running after their little one, Indigo -- who's turning four this summer. She's holdin' the little dude in some pics and just tryna keep up in others.