The girl group - who originally started out as the Sugababes - announced their reunion last month, but insisted that new material won't be released until 2013.
However, the trio recently hinted that their new collection was nearly finished and have now indicated that the entire set is complete.
"With the girls in the studio. I think the album is finished!!!" Siobhan Donaghy tweeted, before adding: "Whoop!"
Mutya Keisha Siobhan have worked with a range of producers and songwriters including Emeli Sandé, Naughty Boy, ex-All Saints singer Shaznay Lewis and MNEK.
Keisha Buchanan recently wished the current Sugagabes lineup - which includes Heidi Range, Amelle Berrabah and Jade Ewen - "the best of luck" and insisted that there are no hard feelings.
Watch Mutya Keisha Siobhan perform their debut hit 'Overload' below: