Brown wowed audience members after stepping into the role of Eva Perón midway through a performance of "Evita" in London's West End on July 24.

On July 24, the Cosmopolitan cover girl suddenly exited the stage mid-show as she had fallen ill. According to People, Rachel’s departure was announced during intermission, and her understudy, Bella Brown, stepped into the role despite appearing as Perón’s Mistress earlier in the night.

The moment captured what theater lovers know but audiences don't always see: understudies and swings must be ready at a moment's notice.