Pop princess Britney Spears moves her cast and crew back to Las Vegas on Thursday to start onstage rehearsals of her new-look “Britney: Piece of Me” at Axis at Planet Hollywood.

Since Jennifer Lopez has her stage all set at Planet Hollywood for her new resident show “All I Have,” Britney will be working out of another hotel property being kept secret.

I’m reliably told that about 75 percent of the hit show will be with new music, songs, dance routines and costumes being added as of Valentine’s Day Weekend when she’s back onstage on the Strip.

It also is going to be a new-look Britney, who has trimmed her body into amazing shape while on a break from the Strip back home in Los Angeles. The 34-year-old superstar flaunted her new, sexy and defined look of toned legs, sculpted arms and whittled waistline on Instagram videos Tuesday.

The new costumes Britney has ordered for her resumed residency will allow for maximum exposure to show off her assets. In addition to her tough show and dance rehearsal schedule in L.A. and here, the workout fanatic credits rigorous cardio training, yoga, boxing and treadmill runs for her keep-fit regimen.

Originally posted by Ramooon

JLo effect is real.

Originally posted by Ramooon

JLo effect is real.

Originally posted by Ramooon

JLo effect is real.

Originally posted by Ramooon

JLo effect is real.

Originally posted by Ramooon

JLo effect is real.