Drew Barrymore likes to strip outdoors — when no one’s there. The “Charlie’s Angels” star — who famously flashed David Letterman on his show — has no regrets about her breast-baring moment. “How fun was that?” Barrymore told Parade magazine. “I’m so glad I was so free at one point in my life.” When asked if she’s no longer free, Barrymore said, “I think I am and I think it alarms people ... I’ll drive in Ireland and park my car and run out into a field and rip all my clothes off and just run in the wheat fields naked.”