Australian pop star Sia has offered a public apology to viewers who were offended by her controversial new music video which features Shia LaBeouf cavorting with a child dancer.

The promo for the singer's new track Elastic Heart features the Hollywood actor dancing around in a pair of dirty, flesh-coloured underpants with Maddie Ziegler, the 12 year old who appeared in the video for Sia's previous hit Chandelier.

Some fans have complained about the close contact between 28-year-old LaBeouf and the young dance star in the footage, and Sia, whose full name is Sia Furler, has now offered an apology for causing any "upset".

In a series of posts on Twitter.com, she writes, "Anticipated some 'paedophelia!!!' cries for this video. All I can say is Maddie and Shia are two of the only actors I felt could play... these two warring 'Sia' self states... I apologise to those who feel triggered by Elastic Heart. My intention was to create some emotional content, not to upset anybody."