The singer took to the social network site this morning, writing:
"I've absolutely loved my time on The Voice, and I hope everyone saw and knows how passionately I felt about the show."
“However, I can't wait to promote my new record around the world and that has to take priority," she added, concluding:
"I shall be keeping a very close eye on series three, showing my support in every way I can, and really hope that in some way that I can be part of the show."
The 25-year-old was forced to delay her tour earlier this year, after it clashed with season 2 of the show.
In a statement released today, Mark Linsey, BBC controller of entertainment commissioning, said:
"We're so sorry to see Jessie go as she's been an exceptional coach on - and advocate for - The Voice, but we totally support her decision to leave due to touring commitments overseas.
"We very much hope that Jessie will remain part of the show and come back and perform for us next series.
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"In the meantime, we will now start the search for a new coach."
The Price Tag singer divided audiences with her judging skills, and audience ratings dropped during the second series.
The other coaches, who include Sir Tom Jones, Danny O'Donoghue and Will.i.am, have not yet been confirmed as returning.
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The BBC will now begin the search to replace Jessie for series 3, due to start filming later this year.
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