Pop powerhouse Jessie J has revealed that she needs to stack on the pounds after using crutches while her broken foot healed caused her to slim down without even trying. 

The 'Nobody's Perfect' hitmaker explained to the Daily Star that the physical exertion from using the sticks resulted in unwanted weight loss:

“I still have to take it quite slowly, and I’ll be sitting down in some parts of the show. But to be honest I’m just desperate to put weight on."

“When you’re on crutches, as I was all summer, you burn 30% more body fat. It’s like working out all the time, so I really need to add a few pounds."

She will kick off her headlining tour in Birmingham tonight, October 17, and added that her fans - or Heartbeats as she calls them - are in for some surprises:

“There will be different versions of songs I’ve done for years, and a few covers too. I’m doing an 80s soul funk classic. I can’t say any more than that but it’s one of my favourite songs. People might be surprised.”

"There will be stuff people haven’t heard because I’m writing whenever I can. There’s just no time for me to go to the studio, so I always write lyrics down on my phone.”

Watch her recent performance of 'Domino' in London below: