SINGER, model and actor ­Sophie Monk has become the first Australian celebrity to have an alleged cyber stalker charged with harassing her on social media.

James McCabe allegedly bombarded the 34-year-old with up to 150 sexually explicit and threatening posts on Twitter every day.

Mr McCabe allegedly used his Twitter account to produce streams of sometimes indecipherable rants over five years in which he said he pursued Satan and told Monk to "pray pray pray".

He also allegedly spoke of "saving" Monk during a sexually explicit tweet.

Monk finally contacted police after Mr McCabe allegedly made death threats ­towards her and another family member.

The 30-year-old was arrested by police at his Tasmanian home earlier this month.

"When I am in Australia, I sleep with the light on," the Date Movie actor said.

She added that the alleged harassment has intensified since she returned home to Australia permanently from California earlier in the year.

Next month she will make a new home in Sydney when she joins Jules Lund, Merrick Watts and Mel B on a new radio breakfast show.

It is alleged that in the weeks leading up to when police arrested Mr McCabe, the tweets increased in number and intensity.

When contacted for comment, Mr McCabe said he had co-operated fully with police - giving them his phone and personal recordings of Monk singing - and stopped tweeting her on the day of his arrest.

He said his interest in Monk stretched back to 1999 when she was unearthed as a singer in the breakout reality show Popstars, which saw her plucked from obscurity along with four other young women who went on to form the all-girl band Bardot.

"I have followed her since Popstars. When I first saw her, I was a drug addict and she just stood out. I thought she was this regular girl who had turned her life around and I wanted to do the same," Mr McCabe said, adding that he has never met the actor.