Speaking in an interview in British OK! magazine, the E.T. singer said: 'If people want a role model, they can have Miley Cyrus. I was never a saint. I'm a human being and I mess up sometimes.'
The 26-year-old admitted that of course she has kissed a girl, before gushing about her husband Russell Brand, 35.
Katy, who has been married to the British funnyman for six months, described Russell as 'thought-provoking, articulate, a real advocate'.
But she said she has to stop him when he flirts with her mother over email.
She added: 'It's totally inappropriate and I tell him to stop.'