Michael Cera emailed Greta Gerwig to arrange Barbie cameo – after his manager almost 'blew it'

'Superbad' star Michael Cera has told how he personally reached out to Greta Gerwig via email to arrange a cameo in the 'Barbie' film, after his manager nearly "blew it" for him by saying he "probably wouldn't want to do" the motion picture.