Rowland and Rubio will be on the show when it starts its third season on Fox this fall. They replace Britney Spears and record producer Antonio "L.A." Reid.
It's a reunion for Rowland and Cowell, although American audiences might not know that. She served as a judge for a season on the more successful British version of the music show.
In a news release Monday Rubio told Cowell to "be careful what you wish for." She said she wondered if the notoriously cranky judge would be ready to handle her.
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