Katseye are performing at the O2 Arena in London for two nights this week, and fans at the first show were left shocked by a particular detail they noticed in the crowd14:47, 04 Sep 2026Katseye are performing two shows at the O2 Arena this week, but it's not their impressive vocals and intricate dance moves that have got people talking.‌The K-pop-influenced pop group are playing two nights at the iconic venue in London as part of their Wildworld tour, having taken to the stage on Thursday (September 3) and again tonight (September 4). By all accounts, the atmosphere has been electric, despite Katseye currently touring with only four members of their six-member line-up, after Manon Bannerman and Sophia Laforteza went on temporary hiatus to recover from health issues in February and August, respectively.‌Although the remaining members, Daniela Avanzini, Lara Raj, Megan Skiendiel, and Yoonchae Jeung, have been putting on a fantastic show, there's something else that has been capturing people's attention - the makeup of the audience members.‌Those who attended the opening night have taken to social media to share their surprise at one very noticeable feature of the crowd, and the reaction online has been anything but quiet.One gig-goer, Melissa, posted a video on TikTok shortly after Thursday's show wrapped up, describing herself as utterly "shocked" by what she had witnessed around her in the stands. She had anticipated that the Katseye fanbase would skew young, but nothing quite prepared her for the sheer scale of it.‌Melissa joked that the evening had felt less like a pop concert and more like a children's show, quipping that she thought she had stumbled into a "Wiggles concert" by mistake.Offering a word of warning to anyone heading along on the second night, she said: "I was expecting there to be a lot of kids, because it's Katseye, but if you're going to a concert, I don't think you're going to realise how many there actually are. I thought I was going to a Wiggles concert. That's how many kids there are."A second clip, posted by a woman named Gab, showed the band performing their track Touch while the unmistakable voice of a young child could be heard enthusiastically singing every word in the background.‌Gab captioned the footage with a pointed message: "Can there please be an age limit for Katseye concerts because this is literally all I could hear."The videos quickly racked up responses, with opinion sharply divided between those who felt the youthful crowd detracted from the experience and parents who were simply thrilled their children had a night to remember.Content cannot be displayed without consent‌Many mums and dads defended their decision to bring their little ones along, with one mother writing: "Took my nine-year-old yesterday to see them! What a night! She sang her heart out and told me it was the best night of her life."Another parent offered a more nuanced view: "As a mum of a 10-year-old who's taking my daughter tonight, I do slightly agree, but I do know the songs. The thing is, Katseye came out with a bang with these great dance routines."Of course, young girls are going to recreate these, just like I did with Steps and S Club 7. Some of the songs I used to sing were also rude, but I had no idea what I was singing, for example, Aqua's Barbie Girl, and Spice Girls' 2 Become 1 isn't so innocent."‌Others drew comparisons to the pop acts of previous generations, with one commenter writing: "It's no different to when I was young. I loved Madonna; she was very sexual, but I didn't see that. It was about the music. Let the kids enjoy it."A further supporter added: "Parents grew up with Christina Aguilera, Britney Spears and a whole lot of rap videos on MTV. So we think Katseye is ok."Not everyone was so understanding, however. One attendee painted a rather different picture of the evening, writing: "I was shocked at how many really young girls there were. All singing, dancing and swearing along to the songs. A mum sat next to me looked in utter shock and horror when she heard the words to some of the songs."Article continues belowFor those wondering about the official rules, there is no age restriction in place for seated tickets at the Katseye O2 Arena shows. Floor tickets are a different matter, carrying a 16+ age restriction, and the O2 website advises that attendees may be asked to produce ID before being granted access to that area.