Clarkson has been a "Voice" adviser in previous years. She is no stranger to musical competition shows — she won the first season of Fox's "American Idol." Hudson, another "Idol" alumna, finished in that series' Top 10 in 2004. She later won an Oscar for "Dream Girls."
The early announcement of Clarkson as a coach could be in response to ABC's announcement that it will bring back "American Idol" just a year after it was canceled by Fox after 15 seasons.
ABC has yet to announce who its judges will be for the revived series.
NBC has not yet said who the fourth coach will be for its 14th season.