The 21-year-old pop star has been announced as one of the headliners for BST Hyde Park 2025, which coincidentally falls on the same weekend as the iconic British festival. She will perform in London's Hyde Park on Friday 27 June with support from Girl in Red and The Last Dinner Party. Meanwhile, Glastonbury runs from 25 June to 29 June, meaning Olivia won't be taking the Friday headline slot, but could perform on Saturday or Sunday. Additionally, Olivia will perform two rescheduled shows…