By Caroline Gaspich Natalie Portman revealed that she has a very unexpected connection to Britney Spears as they both rose to fame after starring in the same understudy role when they were kids. The Oscar award-winning actress shared the unlikely matchup this week during a guest appearance on LIVE with Kelly and Mark while promoting her brand new movie May December. In the revealing interview, the 42-year-old actress shared the shocking news that she and Britney were both an understudy for the same play. Back in 1992, the pair both starred as the backup for child star Laura Bell Bundy on the O…