Brit Marling's favorite birthday was when she turned 4 and dressed up as She-Ra Princess of Power aka The Most Powerful Woman in the Universe. Don't worry, the normally revealing She-Ra costume was designed to be more kid-appropriate. Her friends at the party could only dress up as ancillary characters, but not one He-Man showed up. Now, Marling's thinking of throwing another She-Ra birthday party just so some He-Man characters attend.