Mariah Carey has made one of the worst kept secrets in Hollywood official: she is leaving American Idol after one year as a judge.

“W/ global success of ‘#Beautiful’ (#1 in 30+ countries so far) @MariahCarey confirms world tour & says goodbye 2 Idol,” read a message from Carey’s publicists PMK-BNC that the singer later re-Tweeted.

Wrote FOX, FremantleMedia and 19 Entertainment in a joint statement:

“Mariah Carey is a true global icon — one of the most accomplished artists on the planet — and we feel extremely fortunate that she was able to bring her wisdom and experience to the American Idol contestants this season. We know she will remain an inspiration to Idol hopefuls for many seasons to come."

Jennifer Hudson is reportedly on board to take over one vacated seat on Season 13, while Kelly Clarkson may also be close to a deal.

Will you miss Mariah on Idol?

UPDATE: Nicki Minaj has now Tweeted:

“Thank you American Idol for a life changing experience! Wouldn’t trade it for the world! Time to focus on the Music!!! Mmmuuuaahhh!!!”

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.