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 accounts in its honor. Here's one of the latest tweets from @KeithsUndies: "Thanks for following- always so supportive."

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