Happy Birthday, br Justin Timberlake!.br Justin Randall Timberlake br turns 40 years old today.br Here are five things br you may not have known br about the singer.br 1. He started his career on br 'The Mickey Mouse Club' when br he was just 12 years old.br 2. Timberlake was the br first celebrity “Punk’d” br by Ashton Kutcher.br 3. He doesn’t br write down br his lyrics.br 4. Timberlake previously used br Justin Randall as his stage name.br 5. He loves br Baskin-Robbin's br Daiquiri Ice.