Britney Spears and her husband Kevin Federline like the initials S.P. - they've named their second son SUTTON PIERCE. The couple named their first baby Sean Preston after he was born, almost a year to the day before his brother, who made his debut last week (12SEP06). September is shaping up to be a month of celebrations for the pair - Sean Preston celebrated his first birthday on 14 September (06) and Spears and Federline mark their second wedding anniversary today (18SEP06).