Credit: Todd G-John K/Splash News Online

First Posh, then Mary J. Blige — and now Shania Twain? PEOPLE confirms that the country superstar will take a seat next to Simon Cowell as a guest judge at upcoming American Idol auditions.

Twain will fill Paula Abdul’s vacant spot on the judging panel in Chicago on Aug. 31 and Sept. 1.

Blige teamed up with the Idol crew in Atlanta, while Victoria Beckham filled in for Abdul in Boston earlier this month. -… Lisa Ingrassia and Anne Marie Cruz

Todd G-John K/Splash News Online