Sean Preston speaks

(BANG) - Kevin Federline says son Sean Preston has uttered his first word - "dada".

The fledgling rapper insists his 11-month-old son called him "dada" while wife Britney Spears was out of the room.

However, Britney - who is pregnant with the couple's second child - is apparently not convinced Sean said his first word.

A source told Britain's Daily Mirror newspaper: "Britney isn't convinced, but is happy to see Kevin paying so much attention to Sean."

Meanwhile, Kevin made his musical debut at America's Teen Choice Awards earlier this month.

Despite much hype surrounding his debut track, the former dancer's performance of his rap single 'Lose Control' was slammed by critics as a "joke".(C) BANG Media International