Back in July, NBC announced that Girls star Allison Williams would play Peter Pan in its upcoming telecast of Peter Pan Live!, and now we finally have a look at the actress in her boyish costume. Of course, this isn't the first time that we've seen Williams dressed as Peter Pan, as she shared a photo of herself wearing the famous green costume on Instagram shortly after the news was announced. (See below.) She also gave fans a glimpse at the flying training  that she would have to take part in as she prepares for the live-action musical. This is NBC's second live telecast of a musical, the first being 2013's The Sound of Music Live!, which starred Carrie Underwood . The program was a ratings win for NBC, although it was famously met with some harsh criticism by fans online. Hopefully Williams will have an easier time when Peter Pan Live! airs on NBC on Dec. 4.