The lines of music genres are blurring, as artists from different worlds are starting to team up more and more frequently. Colombian beauty Shakira recently let her Twitter followers know she was busy in the studio -- with Blake Shelton!

Even though Shelton and Shakira go head-to-head as their team of artists compete on 'The Voice,' they keep it friendly when not on set. But who would have expected a collaboration between the two? Shakira's known for her Latin hip shakin' tunes, while Shelton keeps it country -- but sure enough, the two were "cookin'" something up in the studio, according to Shakira's tweet.

Shelton responded with his seal of approval, saying, "GREAT song sis!!! It was my honor!!"

Shakira's got a brand new album coming out on March 25 -- maybe the duet will be included on 'Shakira'? The two superstars are both busy with the current season of 'The Voice,' each hoping an artist on their team comes out victorious. Shelton has some stiff competition this season since his wife, Miranda Lambert, will be joining the show -- on Team Shakira.