Happy Birthday, br Willow Smith!.br Willow Camille Reign Smith br turns 20 years old today.br Here are five br fun facts about br the multi-talented br singer.br 1. She was the youngest br artist to sign with Roc br Nation at the age of 9.br 2. Smith likes to write her own novels and re-read them.br 3. She made her film debut with her father, br Will Smith, in the film, 'I Am Legend.'.br 4. The activist is a youth br ambassador for Project Zambi.br 5. She likes to wear br “clothes she can br climb trees in.”.