Jessie J says she is working on a new track for "biggest" thing she's done since performing at the Olympics.

The UK star played alongside Queen at the London 2012 closing ceremony but she told Capital FM that her new project is up there in terms of size.

The 'Domino' star said: "I'm excited. I'm going into the studio. Working, writing a single. I've been offered one of the biggest deals ever in my life, that I'm writing a single for.

"[It's not a movie] but it's one of the next biggest things from the Olympics, for me. I'm excited! I'm very ready to go and do it well and come back and go, 'Haha!'."

Jessie J meanwhile recently jetted off to the States to work on the US edition of her latest album 'Alive'.

She had to cancel a support slot with Robin Thicke in North America, however, to bag studio time.