Demi Lovato falls onstage

Singer Demi Lovato tripped and fell on her knees while walking on the stage and waving to the crowd during a performance.

Sporting casual outfits consisting of a jacket over a black top and matching pants, the singer was walking on the stage and waving to the crowd of around 16,000 students before she tripped and lost her balance at the 2016 WE Day in California on Thursday, reports aceshowbiz.com.

"I'm okay," she assured everyone in attendance as she sat on the floor and raised her hands up in the air while smiling widely.

Similar incidents have happened to Lovato several times before. Last December, she slipped and ended up on her back on the stage during a live appearance at New York City's iHeartRadio Z100 Jingle Ball.

A few months earlier, she took a nasty fall during a performance at a pool party to promote her single "Cool for the summer".

The annual WE Day event celebrates youth who are making a difference in their local and global communities. The 2016 edition was also attended by Paula Abdul, Tyrese Gibson, Ian Somerhalder and many more. Lovato served as a performer as well alongside Selena Gomez and Big Sean.