In a deeply personal Instagram post, Taylor Swift announced that she has tested positive for COVID-19, a revelation that has forced her to postpone her scheduled Eras Tour performance in Chicago.

The 34-year-old music icon shared the update with her 280 million followers, posting a close-up selfie that showed her teary-eyed as she explained the decision. “I’ve been dodging this for four years, but it finally got me,” Swift wrote. “I’m so sorry to let you down.”

For Swift, who has built a reputation for being one of the most dedicated live performers in the industry, the announcement struck an especially painful note. In her 17-year career, she has never once canceled a concert due to illness.