It's almost here!
The pop princess captioned the pic, "4 days people! Go call the Po-Lice! Go call the Governor! #WorkB"
First and foremost, Spears looks positively fierce in the promo shot. Spears shows off tons of curves and cleavage as she's seen wearing teal leotard by The Blonds with a neckline that goes all the way down to her belly button.
The onesie also has matching feathered sleeves, which gives the entire ensemble a hint Sin City glam.
It appears that she's in an elegant dressing room, and there's even a little Las Vegas sign in the background. Because we all know that her residency is happening soon!
As a matter of fact, the singer has been prepping to get into the best shape of her life for her upcoming shows.
"She's been a terror lately, working as hard as she can," Spears' trainer Tony Martinez told E! News exclusively. "She's using all sports right now to get ready for her 90-minute Las Vegas show."
Although her workouts are less than an hour (about 40 minutes), Martinez said they are grueling.
"It is intense, interval training to keep her heart rate up. In a show, she will be dancing and singing non-stop. In her training, she only has about 10 to 15 second rests between each set," Martinez explained.
"She is doing Olympic-style training. This is hardcore stuff. Britney knew she needed to step up her game. She is just drilling it but she likes, too! She loves to sweat and she still talks smack to me."
The Grammy winner tweeted that her new track "Work Bitch" will premiere worldwide Monday, Sept. 16 at 6 p.m. ET on iHeartRadio or your local radio station. She then revealed, in a follow-up tweet, the song will be available at 12:01 a.m. ET on Sept. 17 on ITunes.