Kelly Clarkson's nanny is a huge fan of her flop American Idol film

Kelly Clarkson has jokingly threatened to fire her nanny if she carries out her plans to "treat" the singer's daughter River Rose to a screening of mum's 2003 film flop From Justin To Kelly.

The Since U Been Gone star reluctantly made the film with fellow American Idol finalist Justin Guarini shortly after she won the first season the TV talent show over a decade ago and she recently discovered the woman she hired to help look after her 11-month-old fan is a huge fan.

Clarkson tells Rolling Stone magazine, "She was like, 'My roommate and I used to watch it all the time! I'm totally going to show your daughter From Justin to Kelly'. I'm like, 'I will fire you'."