Brittany Snow felt “liberated” playing an adult film star in her new movie ‘X’. The ‘Pitch Perfect’ star says playing her character in the Ti West horror slasher flick set in the 70s – a porn star Bobby-Lynne Parker – gave her a “freedom” of she has been working throughout her life. The 36-year-old actress told PEOPLE: “Everyone goes on a journey of sorts in their 20s. Then in your 30s, you just sort of become desensitized to what other people think or opinions or standards of beauty. There’s some freedom in just owning what I have, and it’s taken me a long time to get here and I felt liberate…