Country star Blake Shelton left his "The Voice" co-judge Christina Aguilera stunned when he confessed to a major crush on her - because she was convinced the "Honey Bee" singer didn't like her.

The odd couple was getting to know each other on the set of the hit talent show when Aguilera asked Shelton's wife Miranda Lambert for pointers, and she revealed that she had once gifted her man a signed Aguilera tour book - and he was thrilled.

The "Beautiful" singer started to see Shelton in a different light - especially when he told her she was his "free pass" before he wed Lambert, suggesting that the new Mrs. Shelton had agreed she'd be OK if her man cheated on her with the "Beautiful" hitmaker.

Shelton tells Rolling Stone, "I'll never forget the look on her face."