Keith Urban took a subtle swipe at his estranged wife, Nicole Kidman during the first episode of his new reality competition show, RadarOnline.com can report.

Urban previously opened up on The Road about how "lonely and miserable" touring can be. Article continues below advertisement

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Urban's new show, which premiered on CBS over the weekend, follows 12 emerging musicians as they compete to be Urban's opening act on tour.

During one part of the program, the 57-year-old entertained the competitors with his song Straight Line from his most recent album, High .

The song choice was interesting, considering he had previously revealed on Instagram that there is a personal meaning to his music. Article continues below advert

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