Britney’s manager Adam Leber confirms lip syncing because the mother of two, needs vocal help during her many dance-heavy numbers.

“To put on the show that she puts on, it’s virtually impossible to sing the entire time and do what she does,” Leber says. “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.”

This shouldn’t be shocking. Read the rest at RADAR ONLINE.