British singer Kelly Osbourne was petrified her plane would come down during a rocky flight from Australia to Los Angeles.

The 31-year-old star and her travel companion Melinda Varga gripped each other's hands and panicked during the 15-hour long flight to Los Angeles, after experiencing the "worst turbulence ever", and she was convinced it would be her "last day on earth", reports femalefirst.co.uk.

"Never been so scared in our lives! @melindavargainoz & I just experienced the worst turbulence EVER! We held hands so tight our hands swelled up and I think my wrist is sprained," Osbourne posted on Instagram.

"I genuinely thought this would be my last day on earth. Thank god we were together and we have landed safely! All I want is my mum right now," she added.

Osbourne has been busy filming scenes in Australia for the upcoming series of "Australia's Got Talent".