Britney Spears' "Circus" is chugging along, but not without its fair share of setbacks and slip-ups.
The pop star's first tour in five years has been punctuated with "oops, I did it again" type moments worthy of their own blooper reel. The latest: an overzealous fan stormed the stage and tried to shake it with Spears at her Sunday night show in Connecticut, sending security guards into a frenzy and racking up an arrest.
With the news that Spears is expanding the international leg of her tour beyond Canada and London (where she's reportedly requested a stripper pole in her hotel suite for off-stage workouts) to Sweden, Germany, France and Russia, it seems an appropriate time to assess what mistakes Spears might want to avoid as she greets her global audience.
Below, ABCNews.com takes a look at four major mess-ups from Spears' "Circus" tour thus far and as a point of reference, looks back on one of the biggest blunders of the 27-year-old pop star's career.
Spears concert-goers play by her rules, and that means no smoking -- or else she stops the show.
The pop star left the stage for half an hour at an April show in Vancouver, Canada, apparently because of smoke in the audience. Spears stopped performing about 15 minutes into her show, and an announcer told fans to put out their cigarettes, some of which may not have been of the tobacco variety.
Upon returning to the stage, Spears scolded the crowd, saying "Don't smoke weed." Following the show, Spears' publicist, Holly Shakoor, issued a statement apologizing to fans about the delay. The statement said "crew members above the stage became ill due to a ventilation issue."
Funny -- Spears didn't seem to mind smoke back in July 2008, when she was publicly slammed for puffing cigarettes in front of her young sons.
Spears is in the business of making records and so, it seems, are some members of her crew, although you won't be hearing their tunes on the radio any time soon.
In March two of Spears' tour roadies setting up for her stop in Pittsburgh ended up with a couple police records for criminal conspiracy, disorderly conduct, public drunkenness, simple assault and resisting arrest.
It all started when Pittsburgh police say they saw Rockey Dickey, a member of Spears' crew, punch a complete stranger in the face. When an officer tried to stop the fight, Dickey allegedly swung at the cop. Officers ended up using a taser to subdue him.
But if that wasn't enough, police say Alex Montes, who also works for Spears, tried to come to his buddy's aid by putting one the arresting officers in a headlock.
Following the incident, Spears quickly put distance between herself and the crew members in a statement released on her web site: "Last night two employees of a company contracted to provide equipment for "The Circus," Starring Britney Spears tour were arrested in Pittsburgh, Pa. However, neither of the men involved are employees of the tour or Ms. Spears. The two individuals have since been dismissed by their employer. "The Circus Starring Britney Spears tour does not support or tolerate this type of behavior."