BLAKE SHELTON Threatens Mag Over Affair Allegation

We've learned Shelton's attorneys have fired a letter to In Touch magazine, demanding they retract their story about Shelton and Groves carrying on an affair.

In the letter, we're told Shelton's attorneys describe Groves as someone who became "infatuated" with Shelton. The letter accuses the magazine of using Grove as its source, and any insinuation by her that she had an affair with Blake is a lie.

The legal letter is strong,
"Mr. Shelton did not have a sexual relationship or affair of any nature whatsoever with Ms. Groves."

Since the rumor surface...