Blake Shelton to sue magazine over affair allegation?

Country star Blake Shelton has reportedly threatened to sue an entertainment magazine for running a story that he had an affair with singer Cady Groves.

"The Voice" mentor's attorneys have sent a letter to the magazine, demanding they retract the story about Shelton having the affair, reported TMZ.

In the letter, 39-year-old Shelton's attorneys describe the 26-year-old "This Little Girl" singer as someone "infatuated" with Shelton.

The letter accuses the magazine of using her as its source.

"Mr Shelton did not have a sexual relationship or affair of any nature whatsoever with Ms Groves," read the statement.