Keith Urban and Carrie Underwood will sing together on his new Ripcord album. The “Wasted Time” singer shared the news on the 2016 ACM Awards red carpet on Sunday (April 3). That makes at least two collaborations on the project.

Urban hasn’t called either true duets. Pitbull appears on “Sun Don’t Let Me Down,” adding a rap verse. It’s not clear which track Underwood sings on, and if she’s a featured performer or a backing vocalist.

"I got Pitbull, and Carrie's on the record,” he confirmed to ET on Sunday. “Carrie Underwood's on there, as well.”

The appearance makes this week’s series finale of American Idol an even more compelling watch. Urban is a judge, and Underwood is set to perform during the final days of the farewell season. Earlier he told ET he might get to sing with one of the alumni set to perform. Suddenly the prospect seems much more enticing.

Ripcord promises to be a diverse album full of many of Urban’s recent influences. Many of the songwriters are L.A. based, while a few are trying on country music for the first time. He’s revealed 12 song titles, including three singles. “Wasted Time” is the current single, and Urban performed it at the 2016 ACM Awards in Las Vegas on Sunday (April 3).

Look for Ripcord in stores and online on May 6. Like he did with Fuse, Urban will rely on a team of producers, including Bruno Mars' "Uptown Funk" producer Jeff Bhasker.

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See Pics of Carrie Underwood From the 2016 ACM Awards