http://www.newsweek.com/what-covid-breakthrough-case-explained-dancing-stars-derek-hough-1650176

Derek Hough, a U.S. professional dancer and Dancing With the Stars judge, has announced that he has a breakthrough case of COVID-19.

The media personality said in an Instagram post released on Tuesday: "Even though I've been fully vaccinated, I've just been diagnosed with a breakthrough case of COVID."