JFX

THURSDAY, JULY 26, 2007 6:00 p.m. EDT

Britney Spears may have hoped for a quiet retreat when she took her two boys, 10-month-old Jayden James, and Sean Preston, 22 months, to the Wynn hotel in Las Vegas for a few days. But now, an insider tells Life & Style, that it sure hasn’t turned out that way!

An insider close to Brit's estranged hubby Kevin Federline claims that Britney broke her custody agreement with their dad, Kevin, when she took the boys away from LA without written permission.

That was the final straw for Kevin! His lawyer, Mark Vincent Kaplan, ordered Britney on July 26 to bring the children back to Los Angeles immediately.

Stay tuned for more on this developing story...