Radio.com recently spoke with Urban about his new album, and why he decided should Lambert share the mic with him. "We Were Us" was written by Jimmy Robbins, Nicolle Galyon and Jon Nite, and Urban said choosing Lambert to sing on the track was a no-brainer.

"I just love Miranda's voice. I love her artistry. We did some shows together many years ago. She got up and did a song with me each night and I loved our voices together," he said.

Urban explained that in the back of his mind, he has always hoped that he would find a song that they could duet on together. "'We Were Us' came along and it's not the kind of song Miranda would normally do, but her voice is the first one I heard in my head," he said. "I called her up and sent her the song and she loved it and came to the studio. Blake came along as well and hung out for the day. Miranda and I went in and sang the song and I'm just so happy at the way it turned out."

"We Were Us" tells the story of two former flames looking back on their lost love. Lambert and Urban share the chorus and the nostalgia.