Britney Spears and Kevin Federline have reached an agreement to share custody of their two children - at least for the rest of the month, and once Spears returns with 16-month-old Sean Preston and 4-month-old Jayden James from a week-long jaunt to Miami. After that, Federline will be allowed to visit the kids at Spears' home from noon to 4 pm on Mondays, Wednesdays and Fridays - undoubtedly cutting into Dad's own nap time, yeah - while Spears will make her "best efforts to ensure that no third party" interferes with the father-sons bonding. (Why is everyone staring at Paris?) Brit and K-Fed have not worked out any custody arrangements beyond Jan. 31, because that's just how they roll, y'all.