Britney Spears has been working hard and will sing live in her Vegas show.

It was rumored that Spears will lip-sync during her Britney:Pieces of Me shows during her 2-year Las Vegas residency.

However, Spears' manager, Larry Rudolph, made it clear in an interview with Billboard that Spears will be singing live.

"She's going to be singing live," Rudolph said. "She does choreography and vocal coaching every day. The vocal coaching is really just to strengthen her voice and get her to a point where she can go out there every night and do a full show."

"There might be some numbers where she's full out dancing with a [vocal] track underneath her, but there won't be any lip-syncing across the board on anything," he added.

Spears' residency is set to begin Dec. 27, and she will have a total of 50 shows.

Each show consists of a 90-minute performance of 21 of Spears' greatest hits, with 14 dancers and a 4-piece band.

The theater has traditional seating as well as a dance floor, private tables, and bottle service.

Spears' show will also include tracks from her new untitled album set to release Dec. 3.

Photo Courtesy of FOX