'Dancing With the Stars' pro Kym Johnson, whose partner is front-runner Hines Ward, suffered a undisclosed injury today while rehearsing for next week's performance show.

Apparently the couple took a nasty tumble at the rehearsal studio, reports E! Online, and it was bad enough that Johnson was rushed to the hospital on a stretcher while wearing an oxygen mask as her distraught partner looked on.

As the remaining contestants head into the semi-finals, Johnson's injury could potentially be a crushing blow to the Pittsburgh Steeler, who has impressed the judges and topped the leaderboard week after week.