The 32-year-old left the glitter and sparkle at Wembley to perform an intimate orchestral show during his headline set at London's Meltdown festival.
The singer, who curated the Southbank Centre's 2026 festival, was joined by Jules Buckley Orchestra for the fundraising event on Tuesday evening.
It comes days after Styles' kicked off his record-breaking residency at London's Wembley Stadium where he is set to play 12 nights.
"Thank you so much for being here tonight," he said.
"Feels both present and incredibly not present to be so aware that you're in the middle of your career highlight for me."
"For anyone who has been to the tour, it's a little bit different in case you can't tell."
"There will be no nipples," he joked, referencing his chest baring tour fashion.
The evening began with the orchestra greeted on to the stage by an eager audience with the musicians taking their seats in a matching white shirt, black trousers and oversized black bow.
Styles followed on soon after to a roar of cheers before opening the show with a rendition of Boyfriends.
He went on to sing a combination of songs from across his four albums including Paint By Numbers, Fine Line, Two Ghosts and Matilda.
"I've always been a lover of orchestral music, classical music, and it's quite an intimidating field to step into as someone who doesn't, cannot, read music," he said.
He later praised the composer for making him feel so welcome, adding that he "never made me feel like I didn't belong there in any way".
"It's been beautiful collaborating with him."
"Nights like tonight I feel incredibly privileged to get to play with such incredibly talented musicians."
Styles is set to smash the record for the most performances by any artist in a single year at Wembley Stadium, beating Coldplay's record of 10 performances there last year as well as Taylor Swift's record for the most concerts performed at the national stadium by a solo artist during a single concert run.
The Watermelon Sugar singer released his fourth studio album in March and is weeks into his global tour with upcoming dates in New York, Sao Paulo, Mexico City, Melbourne and Sydney.
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