Disney superstar Miley Cyrus has filmed a dance video - after she was challenged to a battle by the director of Step Up 2: The Streets.

Filmmaker Jon Chu and the movie's star Adam Sevani posted a video on YouTube.com earlier this week in which they challenged the 15-year-old to a no-rules "online dance battle".

And now the Hannah Montana star and her best friend/back-up dancer Mandy Jiroux have stepped up to the dare, recruiting the movie's dance crew to join her in a choreographed performance set to Madonna's hit single 4 Minutes.

In the video, Cyrus and her company of performers, dubbed the "m+m Cru", are seen carrying out a series of impressive dance manoeuvres, including back-flips.