Demi Lovato strikes out at cyber bullies: 'You're really sick in the head'

demi-lovato-fallon-getty.jpg Demi Lovato is sick and tired of people being nasty to her and others on Twitter -- and she made her feelings very clear in a series of tweets on Sunday night, striking out against the bullies who make her time online less-than-pleasant.

"It really surprises me the hateful things people say on the internet," she writes. "After all the awareness of cyber-bullying... I mean wow. So sad."

She even offers those mean people a prayer. "Praying for all the people in the world who feel it's okay to bully people over the internet," she tweets, "because if you are one of those people, then you must have had something really terrible happen to your childhood or you're really sick in the head. Must suck to be born without a heart."

Ouch!

Lovato is currently one of a handful of celebrities supporting the film "Bully," an anti-bullying documentary so shocking it was given an R rating by the MPAA, making it inaccessible to the high school students who could be most impacted by its powerful message. Katy Butler, a high school student in Michigan who has been the victim of bullying, began a petition to get the MPAA to reduce the rating to a PG-13.

The petition went viral and has been signed by Lovato, Ellen DeGeneres, 20 members of congress, and over 280,000 other signers. "Please help repeal the R rating on 'BULLY.' EVERYONE should be able to see it. Sign the petition," Lovato tweeted to her 6 million followers, linking the Change.org petition.

Check out the trailer for the film below.

Photo/Video credit: Getty Images