Jessie J is reportedly worried she's "taken on too much".

The British songstress is currently a judge on the UK version of The Voice and is reportedly struggling to maintain her relentless work schedule.

Jessie is said to be romancing rapper Tinie Tempah and is buckling under the pressure of maintaining both her professional and personal lives.

"Jessie told pals, I'm worried I've taken on too much.' She often works 18-hour days and gets by on four hours' sleep and two meals a day," a source told British magazine more!

Jessie burst onto the music scene with her debut single Do It Like a Dude in late 2010 and has since being making waves in the industry. The 24-year-old star is said to be working hard to maintain her level of popularity.

"She's worried that if she doesn't say yes to every career opportunity, everything could slip away," the insider added.

"Her inner circle are concerned. If Jessie's finding her schedule hard to handle now, they fear she may struggle once she has live shows every weekend."