Taylor Swift's Eras Tour may have looked perfect from the outside, but there was plenty of difficulty behind the scenes that fans didn't know was happening. In episode 3 of Swift's Disney+ docuseries, The End of an Era, background vocalist Jeslyn Gorman revealed that she was diagnosed with breast cancer during the tour. "Jeslyn is one of the most talented, resilient, loving people I've been around," Swift, 36, gushed during the Friday, December 19, episode. "She was the newest addition to our backup singers.