Ooohwee, things are heating up on "The Voice."

This year's singing competition may be the hottest ever, but that doesn't scare Shakira who says she has a secret weapon.

"I had to have my secret weapon," the pop star says of Lambert. "She's like a spy in the Shelton headquarters." As for what she plans to do with her secret weapon. Shakira says she's going to win. "I am determined to defeat Mr. Blake Shelton," Shakira insists.

She definitely has a tough road ahead of her as Blake has won the competition three times. Fans can watch the competetive pair Monday and Tuesday nights on NBc.