According to People, its because she flew in a private plane to Las Vegas on Wednesday afternoon with her two children, Sean Preston & Jayden James.
Sources tell People she went to dinner at the Country Club at the Wynn Las Vegas, and that she also made arrangements to have her hotel room childproofed for the visit.
But People points out that, the trip could also pose some problems for any custody battle with ex-husband Kevin Federline: Under California law, neither parent is allowed to take a child out of state without written permission from the other or by obtaining a court order. According to a source close to Federline, Spears failed to notify her ex or his attorney, Mark Vincent Kaplan, that she was taking the children to Las Vegas.
A lawyer for Spears did not respond to Peoples calls for comment.
Access Hollywood has reached out to Britneys record label reps for several Britney-related stories in the past week, but the record label has not responded.
Copyright 2015 by NBC Universal, Inc. All rights reserved.
This material may not be published, broadcast, rewritten or redistributed.