Kelly Clarkson was battling appendicitis as she hosted and performed at the Billboard Music Awards on Wednesday. Just hours later, she had her appendix removed. "Not gonna lie,” she wrote on Twitter, “I may or may not have broken down in tears after the show from pain.” She flew home to Cedars-Sinai Medical Center, where she underwent surgery the next morning. "Feeling awesome now," she added. Clarkson's decision to perform while feeling ill could have been deadly, however.