Lynne Spears also says Sam Lufti cut off singer's phone lines to remove communication channels
'Toxic' singer's father describes her meltdown as a 'battle for life and death'
Sam Lufti's lawyers have said that she also 'overdosed' on prescription pills
Singer reportedly walks off set while four acts perform in her absence
Singers join Simon Cowell and LA Reid on the reality show's judging panel
'Femme Fatale' star set to become a judge on US series, say reports
Reports suggest that the singer could appear alongside Simon Cowell on the new US series of the show
'Femme Fatale' singer reaches undisclosed agreement with Fernando Flores
Singer is thought to be engaged to boyfriend Jason Trawick
Singer allegedly owes Advanced Security Concepts Corporation over $140,000 (£90,000)