The 44-year-old Australian singer - who is the young sister of pop princess Kylie Minogue - hasn't released new music since 2015 single 'Summer of Love', but has unveiled her new song 'Galaxy' which she worked on with the 'Cheap Thrills' hitmaker.
Speaking about how nervous she was sharing her ideas for the track to Sia, Dannii said: ''Sending my version of the song to Sia was nerve-wrecking but she really liked it.''
The 'Put The Needle On It' hitmaker might be back, but says she's only going to be dropping music and touring ''sporadically'' as it's just ''fun'' for her as she doesn't want to be a ''slave'' to record labels or the charts.
She said: ''Music is fun for me now.
''I've set it up so I can do fun things like tours and releasing music, yet do it sporadically, because I don't want to be a slave to it.
''I need everything to revolve around me having a life.''
The brunette beauty hasn't brought out a record since 2007's 'Club Disco' LP, and since then she has been trying to adjust to how the music industry works now.
She said in 2015: ''I'm trying to take it all on board and navigate everything that's going on. I definitely have the bug again.''
Dannii has realised just how much the rise in digital music has transformed the way records are produced and promoted, but she believes one thing that hasn't altered is that it still ''comes down to making music you love''.
She said previously: ''The music industry has changed beyond recognition since I last had a record out. It's all downloads and online now. But it still comes down to making music you love.''
The 'Perfection' singer previously said that something was ''holding her back'' from returning to her pop music career, but now she is ''settled'' she is ready to start again.
She said: ''I've been wanting to do music for ages but something was holding me back.
''Now I feel really settled. I feel like I'm in a personal space where I can do it and it's going to be fun.''
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