Drew Barrymore is defending Britney Spears amid the singer's ongoing conservatorship battle.In a new interview with ET's Kevin Frazier, the 46-year-old actress explains why she «purposely» has stayed out of the #FreeBritney conversation, until now. «I feel that there's a human being at the core of this. But since she put herself out there more ... she's the key to her freedom,» Barrymore says.