In addition to Britney's troubles Thursday at Wynn Las Vegas, it has been confirmed that Spears is fighting another battle. This one, with her ex, Kevin Federline.
A source tells, "K-Fed is demanding that she get back to Los Angeles because she isn't allowed to have the kids out of state."
Another Federline source says,
"Britney did not have written permission to take the kids out of state. She needs written permission and she never got it or alerted people she was leaving. I'm sure Kevin's lawyer, Mark Vincent Kaplan, is mulling over how to handle this."
Source