What drives a show business fan to become a stalker? The trend certainly seems on the rise.

The cult of celerity grows bigger every year, aided by the internet, more pervasive promotion from the entertainment industry and unhealthy TV addiction by some people. 

For a celebrity, every new fan brings with them the chance that their interest will turn to an obsession that could endanger their heartthrob. 

A former psychiatric patient accused of stalking Uma Thurman told her parents he would kill himself if he was not allowed to talk to her. He believed he was married to Uma and had beenwith her in a previous life.

Uma Thurman's stalker - now heading to court with Uma testifying - managed to get frighteningly close to the actor most recently known for her role in ultra-vilent film Kill Bill.

Jack Jordan, 37, loitered for hours at Thurman's Manhattan apartment. Filled with obsessions and delusions, he even once made into Thurman's trailer on a film set 

Jordan is now accused of stalking and aggravated harassment.

Top 5 Scariest Celebrity Stalkers

1. High Fidelity star John Cusack, 40, had a restraining order granted against stalker Emily Leatherman in 2006 who had her mail sent to his house and then used to deliver them to his house with bags full of rocks and screwdrivers.
2. Tween star Hillary Duff has two stalkers, but one is so dedicated the 19-year-old moved to the U.S. solely to meet and get involved with Hillary. ‘Max' shared his intentions of 'removing' his 'enemies' to get closer to Duff. He even visited her mother.
3. Dessarae Bradford, 32, was the woman who thought she could be Colin Farrell's BEST FRIEND! He called the police when she handed him copy of her self-published book Colin Farrell: A Dark Twisted Puppy.
4. Basic Instinct, starring Michael Douglas, saw Douglas's character pursued by a murderous lover. In real life, stalker Dawnette Knight was sent to prison after threatening Douglas's wife Catherine Zeta-Jones and planning her funeral. "Catherine is going to be sliced up like meat on a bone and fed to the dogs. 
5. A passionate Naomi Robson fan dated, drugged, raped and filmed his victims and went to court just this week. The Melbourne man has been charged with 33 counts of rape and more of indecent assault after police seized videotapes allegedly showing him raping women whose faces had been covered with images the former Today Tonight TV host.