A highlight of a recent episode of the Australian version of The Voice wasn't a performance by a contestant, but a glimpse of Keith Urban's Calvin Klein undies. Though the sighting was nothing more than a flash of the waistband when he stood up, it was enough to inspire cheeky fans to start a couple twitter pages in its honor. Here's one of the latest tweets from the site: "Thanks for following- always so supportive."

Those who are curious can check out: https://twitter.com/#!/KeithsUndies