LONDON: Teen star Miley Cyrus is under fire gain after a video of her teaching her nine-year-old sister how to dirty dance has been leaked online. The ''Hannah Montana'' star, who recently gyrated on stage at the Royal Variety Performance in Blackpool here wearing only a tiny pair of leather hotpants, can be seen in a video clip urging Noah Cyrus to perform a routine to Akon''s ''Smack That'' featuring provocative steps and pats to her butt, Female First online reported.

The 17-year-old teen sensation, who has recently said she is keen to appeal to a wider, more adult audience, is used to shocking her fans. Last year she appeared in a series of semi-nude photographs for US publication Vanity Fair and had to apologise afterwards when fans deemed them inappropriate.

"I took part in a photo shoot that was supposed to be ''artistic'' and now, seeing the photographs and reading the story, I feel so embarrassed. I never intended for any of this to happen and I apologise to my fans who I care so deeply about," Cyrus had said.

In August this year she was also slammed for her dance routine at the Teen Choice Awards where she danced provocatively around a pole.