Leona Lewis doesn't think singers should be 'acting crazy and naked' onstage. The 28-year-old British songstress claims she is concerned with how artists like Miley Cyrus and Rihanna are affecting youth. Leona believes highly sexualised dance moves like twerking is providing young girls with negative encouragement. 'Being sexual and in your face is not great for girls who are quite young,' she told UK newspaper The Mirror. 'It depends what environment you're brought up in, but personally I've got a god-daughter and little nieces and I don't want them to see me acting crazy and naked in my music videos.' Although Leona disagrees with her peers' provocative performances, she believes responsibility ultimately sits with parents. 'But then when my little god-daughter is watching videos and doing all these moves, I say to my best friend 'you need to turn that off,' she explained. 'So it's up to the parents as well to be able to control what their children are watching. It's like, 'don't twerk, you're a six year old. Stop it.''