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21 August 2013, 13:35
The 'Criminal' star says the pair's new song "evokes so much emotion" whenever she listens to it.
Britney Spears and Sia have been praising each other on Twitter after recording a "heartbreaking" team-up for Britney's brand new album.
The 'I Wanna Go' singer is currently hard at work on her eighth studio album, expect to be announced within the next month, and was in the studio again this week with US singer-songwriter.
"@BritneySpears your vocal on this tune is outstanding. WERK!" Sia posted to Britney after their studio session, to which Britney replied: "One of the most beautiful song I have recored in a LONG time :).
"The song is both beautiful and heartbreaking @Sia," Britney added. "Evokes SO much emotion every time I hear it."
Check out a picture of Britney Spears in the music video for her song 'Ooh La La' below:
Britney's new album is expected to feature team-ups with the likes of songwriter William Orbit and her album's executive producer, will.i.am
Britney Spears promised fans they will hear new music "sooner" than they expect, while she has also launched a countdown on her official website.