Amanda Holden proved she's a fabulous friend on Saturday, when she shared a photo of herself reading Ant and Dec's new book Once Upon a Tyne.MORE: Ant and Dec confirm reunion with Cat Deeley for SM:TV rebootDoting mum Amanda shared the GIF hours before Britain's Got Talent airs, and could be seen peeking out from behind the book as she sat with her legs crossed on a leather sofa, most likely backstage. WATCH: Amanda Holden reveals she predicted Katy Perry's baby name in JuneAmanda looked as