Allegra DuVal, 35, earns a whopping £20,000 a year dressing up and performing as Britney Spears as a ‘side hustle’ – and says she would ‘die’ if she met the pop princessAllegra DuVal, 35, earns a whopping £20,000 a year dressing up and performing as Britney Spears as a ‘side hustle’ – and says she would ‘die’ if she met the pop princess