At Lollapalooza's third night on August 1st, Olivia Dean delivered a headline performance where she brought out Sam Fender as a surprise guest to perform their collaborative single 'Rein Me In'. This marked the first time the song had been performed live on American soil. Dean took the opportunity to celebrate the recent milestone achievement the song had reached back in the UK, describing the moment as particularly special given the historic significance of their collaboration.

The performance came on the heels of 'Rein Me In' breaking the long-standing record for the longest-running UK Number One single in history. Since its official release over a year prior, the track spent 19 weeks at the top of the UK charts, finally reaching that position in February 2026, making it Fender's first chart-topping hit. The song's achievement surpassed a record that had stood for over seven decades, overtaking Frankie Laine's 1953 hit 'I Believe', which had previously topped the charts for 18 weeks across multiple stints.