Fall Out Boy's Joe Trohman, Andy Hurley, Patrick Stump and Pete Wentz snapped pics on the red carpet before performing at the 2024 iHeartRadio ALTer EGO show.
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The concert, which featured a set from Jared Leto, took place inside the Honda Center in Anaheim, Calif., on Jan. 13.
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Matty Healy performed with his band, The 1975, to a crowd of roaring fans who were on their feet for the entirety of the set.
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Corey Britz, Chris Traynor, Gavin Rossdale and Nik Hughes of Bush met with fans backstage after snapping pics on the red carpet. The band performed later in the evening, with many concertgoers calling their set the "best of the night."
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"Vanderpump Rules" star Tom Sandoval was one of the celebrity guests who attended this year's event, presented By Capital One, and appeared to be in good spirits post-Scandoval.
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5 Seconds of Summer lead vocalist Luke Hemmings also made an appearance on the red carpet and was spotted meeting and hugging members of lovelytheband.
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Damiano David of Måneskin posed for pics on the red carpet before making an appearance on stage midway through the show.
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Patrick Carney and Dan Auerbach of The Black Keys kicked off the show and surprised fans by playing their new song, "Beautiful People," live for the first time.
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Ryan Mendez, Josh Portman, Ryan Key and Sean Mackin of Yellowcard followed The Black Keys' opening set, performing a range of hits including fan-favorite "Ocean Avenue."
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Sum 41's Tom Thacker, Jason McCaslin, Deryck Whibley, Frank Zummo and Dave Baksh took the stage for "one of the band's last" performances ahead of their farewell tour.
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Meanwhile, Emily Roberts, Lizzie Mayland, Aurora Nishevci, Georgia Davies and Abigail Morris of The Last Dinner Party had fun posing for photos before they took the stage for their own energizing set.
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Also featured on the 2024 lineup was Sam Price, Mitchy Collins and Jordan Greenwald of lovelytheband.
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After snapping pics backstage, Mike Shinoda of Linkin Park surprised the crowd by introducing Sum 41 and later performing "Dance, Dance" with Fall Out Boy.
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Gavin Rossdale powered through plenty of Bush's famous hits during his set, including "Glycerine" and "Machinehead."
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The British musician hopped into the audience at one point while singing "Nowhere To Go But Everywhere."
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Fall Out Boy had the whole crowd rocking out to hits like "Sugar, We're Goin Down" and "Thnks fr th Mmrs."
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At one point, the rock band lit up the stage - literally - for "My Songs Know What You Did in the Dark (Light Em Up)."
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Matty Healy pulled out all the stops for fans of The 1975, singing hits like "I'm in Love With You" and "Somebody Else."
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Sum 41's performance marked one of their last-ever sets as they announced in May 2023 that they are disbanding following an upcoming farewell tour.
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Frontman Deryck Whibley didn't hold back as he belted out hits like "In Too Deep" and "Fat Lip" for the lively crowd.
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Earlier in the show, lovelytheband had the audience singing every word to their viral hits, "Sail Away" and "Broken."
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During Thirty Seconds to Mars' set, Jared Leto brought out My Chemical Romance bassist Mikey Way as a special guest to a crowd of ecstatic fans. They performed a powerful rendition of "Attack."
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