However, Britney wanted her kids to see her perform and so treated them to a child-friendly version of her 90-minute show.
A source said: "It was great for Britney to have the children around. There is so much riding on the tour that she had worked herself up and her nerves were getting to her.
"Seeing the boys before her big night helped to relax her. She let them see most of her numbers in rehearsals, but the really sexy ones she left until the late-night run through when they had gone home."
And of course K-Fed is along for the ride, he's reportedly getting $5K a week to accompany Spears and the boys while she finishes off her tour. Not too bad for an unemployed father of four.