Los Angeles, May 15 - Actress-singer Ashley Tisdale has reportedly been troubled by a fan, who posted over thousands tweets on her Twitter account, and then turned up at her doorstep.

Cops allegedly launched a probe after a fan sent 18,888 tweets to the "High School Musical" star in November last year, reports thesun. co. uk.

The stalker, believed to be a man, wrote as though he has some kind of relationship with the 27-year-old actress.

He posted: "My body is yours and even as friends I f***** love how I make u feel like mom maybe we both got issues cuz nobody’s perfect."

Another Tweet read: "I’ll never lose u baby even in 20 years til infinity you’ll always b my best friend." (sic)

The suspect said to have then shown up at Ashley's house, although it's not clear whether he made contact.

He has reportedly been identified and cops are looking to talk to him to determine whether he poses a serious risk to the star. (IANS)