Photo SpecialBritney: Life After Baby

From family fun to spousal spats, see how things have changed for the Federlines since son Sean Preston's arrival. By Emily Fromm

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DEC. 31

After lunch, Spears hit the beach for a seaside swing. That night, she rang in the new year with Federline, who skipped a Las Vegas release party for his rap single, "PopoZão," to be with his wife and her friends at L.A.'s W Hotel (Sean Preston was with a nanny).

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