Readers picked their top 10 sexiest male country artists with Toby Keith, Trace Adkins, Tim McGraw and Kenny Chesney rounding out the top five, in order.
"The biggest surprise is how rapidly over the last couple of years Keith Urban has shot to the head of the class," Editor Bill Gubbins said.
Urban and Kidman are preparing to marry, but have not formally announced a date. Various media reports say they will get hitched this summer.
About 32,000 readers voted in the first annual poll, both online and by mail, Gubbins said.
Newcomers Gary Allan and Chris Cagle ranked sixth and seventh, with established artists George Strait, Alan Jackson and Billy Ray Cyrus Nos. 8-10, respectively.
The magazine has a similar poll ranking the country's music hottest bachelors, but many of the artists picked by readers on this list are married and have families.
"They've made it clear that the wedding ring doesn't matter in terms of sex appeal," Gubbins said.
The magazine will be releasing readers' picks for country's most-beautiful women later this month.