Lily Allen on her West End debut: I'm terrified all the time

Lily Allen has sold more than five million albums worldwide, won countless awards and her song 'Smile' has been streamed more than 57 million times. But now, the artist is earning critical acclaim of a different kind - on the West End stage in supernatural thriller 'A Ghost Story'. Ahead of her West End debut, the singer says it's the most nervous she's been.