The 26-year-old singer said that she often catches mum Mary indulging in a little on-line flirting with her other half.
She told OK magazine, 'My mother flirts with Russell. He's very charming with my parents and he has an ongoing email love letter with my mum, and she loves it.
'It's totally inappropriate and I tell him to stop.
'But what can I say? Russell's brilliant and he makes me laugh like no-one else. We are each other's perfect match.'
And the I Kissed A Girl star added that she would like to do some flirting of her own – with some female celebrities.
'I can't sing a song and not have done it,' she said. 'That would be complete hypocrisy. I fancy Scarlett Johansson, Natalie Portman, and Angelina Jolie. I'd definitely kiss them.'