Keith Urban will be taking the stage at the 2015 CMA Awards for a performance -- but he won't be alone. John Mellencamp will be joining the country superstar.

The Country Music Association announced the addition of Urban and Mellencamp to the lineup for Country Music's Biggest Night on Wednesday (Oct. 14), though there is no word yet on what song (or songs), exactly, the two will be performing. Mellencamp is, however, a key part of Urban's latest single, "John Cougar, John Deere, John 3:16."

Urban and Mellencamp join an already-stacked list of performers for the awards show. Other collaborative performances will include  Thomas Rhett and Fall Out Boy, who will perform a "special collaboration" together, and Eric Church and Hank Williams Jr., who will be kicking off the 2015 CMA Awards with a performance of “Are You Ready for the Country,” which will be released as Williams Jr.’s first song on Nash Icon.

Also in the performance lineup for the evening are Kelsea Ballerini, Miranda Lambert, Maddie & Tae and Kacey Musgraves. Brad Paisley and Carrie Underwood, who will return as the show’s hosts, will each be performing as well.

Urban is nominated in one category this year: Musical Event of the Year, for "Raise 'Em Up," his song with Church.

The 2015 CMA Awards are scheduled to air live from Nashville on Nov. 4 at 8PM ET on ABC.

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