Shakira fans are raising questions about her performance on "The Voice."

Twitter lit up on Tuesday night with many users wondering if she had lipsynched her performance of the song "Empire."  

Shakira is a coach on the NBC singing competition.  One Twitter user blasted both Shakira and the show saying she "shouldn't be able to lip sync on a show that is about live singing talent."  



Another tweeted the singer saying, "Not your style, I'm surprised."  



"Yahoo Music" adds that some viewers also felt Shakira's skimpy lace outfit and signature seductive choreography weren't appropriate for the family audience.