Hilary Duff has reportedly upped her security after being warned by police about an obsessed fan.

The Younger actress is said to have been contacted by officers in Beverly Hills earlier this month (Jul16) when the man hired a limousine on his quest to track down the star.

According to TMZ.com, the man instructed the vehicle's driver to travel around Los Angeles looking for Hilary. He is said to have been holding a crib that he said Hilary owned, but claimed he did not have her address to return it to her.

The website adds that the man proceeded to tell the limo driver about his intention to marry Hilary, with his words leaving the driver so concerned that he called the police.

Officers then apparently contacted Hilary's team, who were already aware of the man and knew what he looked like. They are said to have had issues with him in the past, but things haven't gone far enough for Hilary to seek a restraining order or file a police report.

However, in a bid to protect herself from the man, Hilary is said to have increased the amount of people on her security detail, as well as informing the guards at the gated community in which she lives of the situation so they are on high alert.

It's not the first time Hilary has found herself the victim of a stalker. In November 2006, Russian immigrant Maksim Myaskovskiy was arrested just weeks after Hilary filed court papers accusing Myaskovskiy and his roommate David Joseph Klein of stalking, claiming that he had stated he was planning to buy a weapon and "threatened to kill himself and to engage in dramatic actions" to get Hilary's attention because he "believes they belong together."

Myaskovskiy was sentenced to 117 days in jail and five years probation.