Child Actors Turned Singers: Christina Aguilera

Christina Aguilera's early appearances on 'Star Search' showed she had seriously powerful pipes even as a kid -- and that was before she landed alongside Britney Spears and Justin Timberlake on 'The New Mickey Mouse Club.'

In the years since, she's been both 'Beautiful' and 'Dirrty,' sold an estimated 50 million records, and sometimes been a tabloid fixture. But lately, she's mainly spent a lot of time irritating Adam Levine as a coach on NBC's 'The Voice.'

Watch Christina Aguilera on 'The Mickey Mouse Club'