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Hollywood's brightest stars have donned their most festive apparel for the holiday show of the season ... the 2024 iHeart Radio Jingle Ball.

Check it out ... fans favorites like Katy Perry, Shaboozey and Benson Boone, among others, stepped out Friday night for the annual event. This year, the holiday concert took place at Madison Square Garden in NYC ... and brought out a number of notable celebrities.

As we mentioned, Katy made an appearance, posing for photogs in a jaw-dropping silver gown ahead of her highly anticipated performance.

Taylor Swift may be feeling 35 today, but she's proven over the years that she'll never go out of "Style."

So, in honor of the pop star's milestone birthday, we felt it only right to relive some of her best eras. Whether you're a fan of her country era or her bad-girl "Reputation" vibe, Taylor has always brought it for the red carpet and her various concerts.

In fact, this past year, Taylor has shaken things up a number of times for her record-breaking "Eras" tour ... often swapping out her costumes for jaw-dropping updated looks.

Beyoncé's really earning the name "Cowboy Carter" ... riding away from the Billboard Music Awards with her first country music win after being snubbed by the Country Music Association.

The singer-songwriter took home the trophy for top country female artists at the award ceremony Thursday ... her first win in the genre.

The Queen Bey was also nominated for top dance/electronic artist and top country album ... honors she lost to Charli XCX and Zach Bryan, respectively.

Taylor Swift is reflecting on the end of her record-breaking "Eras" tour ... penning a short and sweet tribute following her final stop in Vancouver, Canada.

The pop star posted on Instagram Wednesday, mere days after she performed 3 sold-out shows at BC Place for the final leg of her global tour. As she's done for other tour stops in the past, Taylor uploaded a number of photos from her show ... this time including highlights from her duet with Gracie Abrams and a heartwarming hug shared with her backup dancers.

She penned alongside the upload ... "It was rare. I was there. I remember it. ♥️"

Sabrina Carpenter’s had a rollercoaster of a year, and she's keeping the wild vibes going -- showing off her bold style during an outing in New York City.

The actor owned the Big Apple streets Tuesday ... turning heads in a black Lillie Rubin mini dress with a bold leopard print collar, buttons, and cuffs.

Sabrina skipped none of the glamor, BTW -- her makeup was flawless, and her voluminous blowout was pure perfection.

Diane Warren's still all smiles, keeping the faith that one day that Oscar will make its way to her mantel.

We caught up with the legend herself -- after 15 near-misses, the songwriter's hoping her 16th shot after submitting her song "The Journey" will finally bring that trophy home.

Wins or losses, Diane's all about the bigger picture at the end of the day ... telling us she's beyond proud of the song, especially since it's featured in "The Six Triple Eight" -- the new Netflix film she's passionate about.

Sabrina Carpenter may be her own No. 1 fan ... admitting her own songs made their way onto her Spotify Wrapped for 2024.

The pop star made the confession in Vogue Arabia, in which she shared she was a bit embarrassed at first to see her own tracks make it onto her personalized end-of-year roundup.

In fact, she felt like she couldn't share her Spotify Wrapped results along with her fellow pop stars ... as she initially thought the outcome was "a bit conceited."

Rachel Lindsay was seen spending a lot of time this weekend with what may be a new male companion who has ties to a major A-list artist ... TMZ has learned.

Witnesses tell us the former "Bachelorette" star and Willie Jones, who collaborated on Beyonce's Cowboy Carter album, were spotted together on Friday at iHeart’s Jingle Ball in Los Angeles.

We're told the two enjoyed each other's company in the Patrón Lounge suite, where they sat closely, chatting, and laughing throughout the night. Our witnesses say when T-Pain hit the stage, the pair got up to dance.

The two continued to spend time together over the weekend. On Sunday, they were spotted shopping at the Melrose Trading Post, where a store called Blk Rchvs posted a photo of them on social media. In the snap, Willie is seen with his arm around Rachel, fueling even more questions about their status.

The commonly used phrase "all good things come to an end" applies not only to us mere mortals, but also to Taylor Swift!

After almost 2 years, 149 shows spanning 5 continents and record-smashing ticket sales, the pop superstar has finally come to the end of her "Eras" tour. Turns out, it was the most profitable concert tour ever -- grossing $2 billion -- and was virtually sold out from start to finish with her "Swifties" relishing every moment of it.

On Sunday, Taylor performed her last gig at BC Place Stadium, Vancouver, Canada, where she dazzled the packed crowd with her typical 46-song set over 3.5 hours.

Katy Perry turned the Jingle Bell Ball 2024 into her own winter wonderland, electrifying the stage as she dropped hit after hit!

Katy kicked off at London's O2 Arena Sunday night with bops from her new album "143" -- but didn’t forget the classics, belting out everything from "I Kissed a Girl" to "Teenage Dream" ... all while rocking a sizzling Santa outfit.

Katy kept the crowd roaring with "Roar" and lit up the arena with "Firework," serving festive realness in a red co-ord and furry white boots. Add in her signature animated stage vibes, and it was pure Katy magic!

Mariah Carey's night of celebrating the holiday spirit took an unexpected turn at her concert in Baltimore when some of her fans got into another physical brawl.

TMZ has obtained video of nasty physical altercation that broke out during Mimi's concert at CFG Bank Arena in Baltimore on Saturday. Witnesses who were nearby tell us the brawl involved 4-5 people and escalated quickly after a drink was thrown.

The video shows absolute commotion in the crowd as punches were exchanged and one person was even put in a headlock. We're told the brawl broke out while Mariah’s chorus was onstage, performing ahead of her return for the final song of the night.

No breakup blues for Sabrina Carpenter here -- she’s ending the year spreading holiday cheer while plugging her new variety special ... and Barry Keoghan's clearly nowhere near her mind RN!

The singer was serving up major holiday glam at the NYC screening of Netflix's "A Nonsense Christmas" last night, looking stunning in a fuzzy black-and-white faux fur outfit, paired with matching heels.

Sabrina was totally in her element, striking poses for the cameras before opening the door for fans and inviting them in to check out her special, which is dropping later Friday on Netflix.

Trisha Yearwood isn't letting her husband Garth Brooks' legal woes keep her from getting in the holiday spirit ... performing at the annual Christmas tree lighting in Washington, D.C. last night.

The country singer ignored the ongoing chatter surrounding GB's rape lawsuit Thursday evening, taking the stage at the Ellipse in President's Park and performing some festive tunes for the national event.

Decked out in a sparkling red pantsuit, Trisha performed for President Joe Biden, Vice President Kamala Harris, and Second Gentleman Doug Emhoff ... taking a bow after wrapping up her seasonal set.

Backstreet Boys singer Kevin Richardson says he didn't see Flavor Flav get kicked out of the green room at the NBC tree lighting ceremony in NYC ... 'cause he woulda stepped in to help his friend if he did.

Kevin was at LAX on Thursday when a photog asked him about what went down backstage at Wednesday's tree lighting event at Rockefeller Center ... including Flav's claim that security guards kicked him out.

The BSB says he saw FF and dapped him up before their gig, but says the greenroom was a madhouse and security was extra tight in the wake of UnitedHealthcare CEO Brian Thompson's murder down the street earlier in the day.

Whitney Cummings says rejecting Sabrina Carpenter from "The Conners" was the best thing that could have happened to the pop star.

We got Whitney on Thursday at LAX and our photog asked the former 'Conners' showrunner about the time Sabrina tried to get on the show.

Whitney says Sabrina auditioned for the role of Harris Conner-Healy back in the day, but they ultimately passed because they were looking for someone with a darker energy.

Ariana Grande expressed strong feelings while opening up about body-shamers ... confessing it’s been overwhelming dealing with endless opinions on what people think she should look like, but making it clear she has no time for them.

The actress was continuing on with her "Wicked" promo duties alongside Cynthia Erivo on the "Oui Oui Baguette" web series when she spilled about the never-ending struggle -- you fix what people say is wrong, and just like that, they've got another problem for other reasons.

Ariana got real about how body-shaming hit her hard in the past, starting as a teenager in the biz, and how tough it’s been to shield herself from all that constant noise since.