The 'Price Tag' singer's future on the BBC reality show had been in some doubt after a number of newspaper reports suggested that she would not coach the next run.
However, the 24-year-old has taken to Twitter to rubbish the rumours and announce her involvement in series two.
"I WILL be a coach on the 2nd series of The Voice UK!" she said. "I'm B B B BACK!
"As I have always said. Unless you hear it from me- Don't always believe what you read! Can't wait! #thevoiceuk #weback *fist to the sky*"
Fellow coach Sir Tom Jones recently hinted that he would return to the Saturday night singing contest too, and revealed that will.i.am and Danny O'Donoghue are also likely to continue on the show.
Annie Lennox, Sir Cliff Richard and Lulu have all previously been linked to spots on the second series of the programme.
The Voice UK will return to BBC One in spring 2013.
Watch Jessie J talk to Digital Spy about The Voice below: