Jessie J has been offered “one of the biggest deals ever”.

The Who You Are singer is working on a new project she thinks could be career-changing, but she’s keeping the details under lock and key.

“I've been offered one of the biggest deals ever in my life that I'm writing a song for,” she told Capital FM. “But I’m not gonna tell anyone [what it is].”

According to the outlet, Jessie confirmed the project is not a movie.

But she said fans can expect something equally as monstrous as her August 2012 performance with Queen at the closing ceremony of the Olympic Games.

“It's one of the next biggest things from the Olympics, for me,” she gushed.

“I'm excited. I'm very ready to go and do it well and come back and go, 'Haha!'"

The 25-year-old English singer/songwriter is currently in Los Angeles.

She was less tight-lipped about her personal projects, but equally as thrilled.

“I'm going into the studio. Working, writing a single," she shared. “I’m excited!”

Jessie has been focused on her recording career as of late after deciding not to return to The Voice UK this year.

The star, who has been replaced by Kylie Minogue, was known for speaking her mind on the panel, with her former fellow mentors sharing details about her “feisty” nature.

"She's feisty at the club. I wanted vodka water and she was like, 'No, you need champagne!'" recently laughed to British magazine new!

"Yeah, and she's Jessie J and that's the way she is,” Sir Tom Jones added.

“She looks at life like that. She's a full-on person.”