Celebrity parents Britney Spears and Kevin Federline are celebrating after their baby son Sean Preston took his first steps earlier this week (begs07AUG06). Federline has revealed Sean, who was born last September (05), made his breakthrough in Las Vegas, Nevada. The dancer-turned-rapper says, "He's still figuring out the whole walking thing. He took his first steps the other day." The couple are looking forward to the birth of their second child, who is due next month (SEP06). Federline adds, "I'm more excited than nervous."