American Idols at the ACMs: Carrie Underwood to Duet with Steven Tyler

04/03/2011 at 06:45 PM EDT

ACMs: Carrie Underwood to Duet with Stever Tyler
Mario Anzuoni/Reuters/Landov
In a night of star-studded pairings – from Rihanna performing with Sugarland to Reese Witherspoon presenting with her Water for Elephants costar Robert Pattinson – Sunday's Academy of Country Music telecast will get a double dose of American Idol.

Current Idol judge Steven Tyler is expected to join former Idol winner – and country superstar Carrie Underwood – at the awards show, PEOPLE has learned.

According to a source, the pair will sing a duet.

The ACMs will air live on CBS starting at 8 p.m. ET.

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