She's such a pro!

Britney Spears is still working out the kinks with her residency at Planet Hollywood in Las Vegas, and during her show the other night (only her second one!), one of her costumes totally fell open in the back!

Britney twirled around like nothing had happened, and one of her dancers quickly zipped and/or snapped her back up so she didn't flash the crowd. Instagram user @kay0gee captured the moment on Instagram and wrote, "'Circus' when her dress almost came off."

All eyes on Brit Brit!