Thursday evening (April 28), Blake Shelton gathered at Nashville's BMI headquarters to celebrate the success of his recent chart-topping hit, 'Who Are You When I'm Not Looking.'

On hand for the celebration were the two songwriters of the hit, John Wiggins and Earl Bud Lee, as well as Shelton's record label, Warner Bros., and other industry folk who are getting used to seeing the singer holding a No. 1 plaque. But Shelton admits, topping the charts is still territory where he feels out of place in many ways.

"I can't get comfortable with singles going No. 1, because I'm afraid if I do, that will be the end of it," Shelton told media prior to the party.

With 'Who Are You When I'm Not Looking' reaching No. 1, it marks the eighth time Shelton has topped the country singles chart. Previous No. 1 hits include 'Austin,' 'The Baby,' 'Some Beach,' 'Home,' 'She Wouldn't Be Gone,' 'Hillbilly Bone' and 'All About Tonight.'

"Every time I put out a single, my insecurities make me look at a song from every angle," Shelton says. "Finally, between the record company and everyone else involved, they said, 'Blake, you just need to relax. This is a great song, and you've recorded it for a reason.' Thank God I've surrounded myself with people I trust, because I go out and find these songs, or however I end up with them on a record ... I record them because I love them, then I talk myself into reasons why they shouldn't be singles. It's kind of a wussy thing to do, I guess [laughs]!"

Shelton's latest single, 'Honey Bee,' written by Rhett Akins and Ben Hayslip, is quickly on its way to becoming the Oklahoma native's ninth No. 1 hit. Click here to read our exclusive interview with Akins about how the song was written.