Instagram/Kevin Federline & Britney Celebrity Explore the whirlwind 2004 romance, marriage, and family life of Britney Spears and Kevin Federline, a defining celebrity saga of the 2000s. April 2, 2026 AceShowbiz - Kevin Federline and Britney Spears shared one of the most high-profile celebrity relationships of the 2000s. Their romance began in 2004 and quickly escalated to engagement and marriage within the same year. This whirlwind union captured significant media attention and resulted in the birth of their two sons, Sean Preston and Jayden James.