Bella Brown made musical magic this week in London when she took over the lead role of Eva Perón midway through Thursday's performance after the show's star, Rachel Zegler, fell ill, per People.

During the July 24 performance of Andrew Lloyd Webber ’s Evita at the London Palladium, the 24-year-old—who stars as the late Eva Perón in the musical—made a sudden exit from the stage without returni...