HOLLYWOOD, Calif. — Miley Cyrus is catching heat for another risqué dance, this one featuring her younger sister, Noah.

In a new viral video for the Hannah Montana star's official fan site, mileyworld.com, Miley is seen urging her 9-year-old sibling to perform a rendition of Akon's raunchy hit, "Smack That."

The video is the latest in a series of sex-charged controversies that have surrounding the showbiz family. Last year, Miley drew criticism when she posed semi-nude for a photo spread in Vanity Fair. She was also accused of pushing the limits with a provocative pole dance at the Teen Choice Awards in August.

The Cyrus family was also questioned in October when Noah wore a dominatrix-like costume to the Children Affected by Aids Foundation's 16th Annual Dream Halloween event.