Ananova:

Avril Lavigne says Britney Spears' stage act is inappropriate.

The Canadian artist says the Toxic singer's act is also all about being a sex symbol.

Lavigne said: "Tons of mums come up to me and say thank you for not dressing like Britney Spears

"Sometimes she just overdoes it with the facial expressions. You should dress like that for your boyfriend, not for the world."

She also had a go at Hilary Duff, calling her a "goody goody".

"She bugs me," she added.