Classically trained singer and "Girls" star Allison Williams has been cast as Peter Pan in NBC's upcoming December 4th telecast of the classic musical "Peter Pan Live!". In an official statement, NBC Entertainment Chairman Robert Greenblatt says: "We couldn't be happier that Allison Williams is our Peter Pan. She's a lovely rising star on the award-winning show 'Girls' -- where she occasionally shows off her incredible vocal talent -- and we think she will bring the perfect blend of 'boyish' vulnerability and bravado to save the day against Christopher Walken's powerful Captain Hook." Executive producers Craig Zadan and Neil Meron add: "Allison Williams is a major find.