Britney Spears "very optimistic" that she'll get her sons back

Britney Spears's close friend Sam Lufti tells PEOPLE that the pop wreck is "very optimistic" that she'll get her sons back as she completes the judge's checklist.

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"We ... signed all the necessary documents that she needed to get done," he said. Spears, he added, is "in a good mood, no problems, very optimistic."

Monday a judge granted Federline physical custody of Sean Preston, 2, and Jayden James, 1, "until further order of the court." Lufti told PEOPLE that what led to the ruling was just a misunderstanding.

"Scheduling conflicts and errors in communication led her to believe that her deadline was later this week rather than [Monday]," Lufti said. "However, once we finally realized what was going on, we completed the list of tasks. ...So everything's looking good."

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