The 15-year-old god-daughter of the Back To Black hitmaker has said that Winehouse, 27, is not very good at being strict.
Dionne told British Company magazine: 'She tried to be scary once but failed!
'She said, 'Dionne, come into my office,' which was actually her bedroom, and she suddenly tried to be all strict! I told her, 'Amy, please don't ever become a judge on The X Factor because you'll so fail!'
'She calls me Big Sister, which is silly because she's twice my age. But she says I give her more advice than she gives me, so she's the little sis.'
The teenager said she would have auditioned for the talent competition but she doesn't entirely agree with how the programme works.
She said: 'I watch it and it's good for people to get themselves known, but they use you to their advantage. Just look at that Wagner! That was a joke. It's not nice that they think they're getting that far because people like them.
'I met Simon [Cowell] once and I was expecting him to say, 'You've not got it,' but he was very nice.'