Reality TV personality and actress Paris Hilton says her beau, Cy Waits, was attacked outside the Superior Court building in Van Nuys, Calif.

Hilton and Waits were on their way to court Wednesday to testify against alleged stalker Nathan Lee Parada when James Rainford allegedly threw water in Waits' face and grabbed his neck.

TMZ said Rainford, who was arrested for the alleged attack, previously pleaded no contest to civil assault for sneaking onto Hilton's property last fall and getting into a scuffle with her private security.

He was sentenced to three years of probation, the Web site said.

"That other psycho intruder just punched Cy in the back of the head as we were walking into the court house. So scary," Hilton said via Twitter Wednesday.

"After the attack, [Hilton and Waits] realized he is the same intruder that showed up to her home on a bicycle a few months ago. He has now been taken into custody. They are both a bit shaken up but thankful security acted quickly," Hilton's publicist told E! News.

Parada allegedly trespassed on her property last year while carrying a knife.