Britney Spears' manager has admitted the pop star mimes during her Las Vegas residency show.
In an interview on medium.com, Spear's manager Adam Leber said it was impossible for Spears to sing live during the entire show of her Piece of Me, two-year Planet Hollywood residency.
Her manager said the star sings when she can during the 90-minute show but said it was impossible to dance as much as she did and still sings live.
"To put on the show that she puts on, it's virtually impossible to sing the entire time and do what she does," Leber told journalist Taffy Brodesser-Akner.
"She's singing on every song, basically, when she has the ability to sing. There's no way you can dance for 90 minutes straight and sing the entire time."
Spears began her Las Vegas residency at Planet Hollywood on December 27, 2013.