Laura Dern and Andra Day: ‘With Bradley Cooper, we knew we were safe to dive in and share our secrets’

One is the Oscar-winning star of ‘Jurassic Park’ and ‘Blue Velvet’. The other is a Grammy-winning singer who played Billie Holiday to an Oscar nod. And now they’re best friends in Bradley Cooper’s new comedy drama ‘Is This Thing On?’. They speak to Adam White about David Lynch, breaking rules, and the evils of ‘preventative Botox’