The 45-year-old singer, who is married to actress Nicole Kidman, was embarrassed when chat show host Jay Leno produced the candid shot from the 'Somebody Like You' hitmaker's bad boy past during an interview, reported Femalefirst.
"There are certain career regrets I have. That falls into that category. That falls into the 'what the hell was I thinking?' category. I'm just glad that I play guitar and not (the) harmonica," he said.
In the 2002 cover shoot, Urban posed nude with nothing but a strategically-placed guitar to cover up his modesty.