Sia has written a track for Christina Aguilera's new album, Lotus. The Australian singer - who has recently found success collaborating with David Guetta on the track "Titanium" - wrote the track "Blank Page" for Christina, and is delighted at the way it sounds.

"So @TheRealXtina Sounds amazing on our next collaboration. Blank page. Squeeeeee (sic)" she wrote on Twitter.

It is not the first time Christina has worked with Sia - she also wrote the track "You Lost Me" on Christina's Bionic album.

Speaking about her forthcoming seventh studio album recently, Christina confirmed it will be a "rebirth" for her. In a series of posts on Twitter, she wrote, "Album title: Lotus. Representing an unbreakable flower that survives under the hardest conditions and still thrives. Self expression and freedom [are album themes]. The album represents a rebirth for me. (sic)"

She also explained there would be many of her trademark ballads on the record. "There will be a 'Lotus' intro to set the tone for the whole record. Conceptually I didn't target one particular sound/genre. There are some beautiful personal ballads on this album. I wouldn't do a record without them," she added.

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