Britney's Back!!!

Bondage, high wire acts, lots of boobies, and LIVE singing, y'all!!!! What the heck?!!!

Live-bloggers on Brit's own website proclaimed, "She's singing LIVE!!!!" Even her fans were shocked at the opening of her Circus tour last night in New Orleans.

So on to the other stuff ... lots of costumes, as you can see in our HUGE gallery below ... during the two-hour, 16-song show last night.

AAANNNDDDD her body's back! Queen B was H-O-T and totally back to her old dancing self - not that girl who looked like she could hardly move during her recent European promotional tour.

all pix courtesy Getty Images

Congrats, Brit!!! We can't wait to see you tomorrow in Atlanta!

Check out some fan video of last night's show! ...