Lester Holt and Carol Hagen
Photo credit: Ivan Nikolov
View All: 2016 Time 100 Gala
Next Lester Holt Slideshow: NBC's 'Today' show Halloween Boo-Nanza show - NY New York United States - Friday 31st October 2014
Perry appeared on James Corden's 'The Late Late Show' on Monday and addressed her long-standing rivalry with Swift.