The pair then took to the clubs with Spears seen out until the wee hours "with the girls" in Los Angeles and Federline doing the town with his cronies in Las Vegas, People said.
However, as of Tuesday, the couple and their 3-month-old son were back together in their Malibu home.
"This has happened before," an insider told People. "They always work it out."
DISCUSS AND COMMENT ON THIS STORY Reality TV World now offers Facebook Comments on our stories. To post a comment, log into Facebook and then 'Add' your comment. To report spam or abuse, click the 'X' in the upper right corner of the comment box.