The 51-year-old singer had previously been rumoured to be making a return to the show that made her a worldwide celebrity.

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Former champions - and the act who beat Susan Boyle in 2009's final - Diversity will also return for the final.
The song choices have also been confirmed for tonight's finalists, with singer-songwriter Ryan O'Shaughnessy set to perform his track 'No Name' for a second time.
Sam Kelly will cover 'Bless the Broken Road' by Rascal Flatts, while Loveable Rogues will perform their self-penned track 'Honest'.
Only Boys Aloud will sing Welsh hymn 'Calon Lân', while Jonathan & Charlotte will undertake a rendition of 'The Prayer', most commonly performed by Celine Dion and Andrea Bocelli.
Finally, Molly Rainford will sing Beyoncé's version of 'Ave Maria', Kai & Natalia will dance to 'Runaway Baby' by Bruno Mars and Ashleigh & Pudsey will perform to the backing of the Mission: Impossible theme. Aquabatique will swim to a collection of different tracks.
A further wildcard act will be announced during the show.
Dog act Ashleigh & Pudsey have topped Digital Spy's poll to predict tonight's winning act.








