"Your English teacher and your gym teacher are getting married," the couple wrote on Instagram to announce the news.

NEW YORK — It started with a friendship bracelet. It ended with an engagement ring. Taylor Swift, the pop superstar, and Travis Kelce, the football champion, are engaged.

The pop star Taylor Swift and the football player Travis Kelce are engaged. “Your English teacher and your gym teacher are getting married,” the couple captioned a joint post on Instagram announcing the news on Tuesday, adding a dynamite emoji and a snippet of Ms. Swift’s song “So High School.”