Ashton Kutcher and Mila Kunis boosted their security as a long-time stalker of the "Jupiter Ascending" star broke out of the Olive Vista Behavioral Health Center in Pomona on Saturday night.

Apparently, Stuart Lynn Dunn, 30, "made an 'unauthorized departure' from the psychiatric facility about 8pm leading to staff at the county probation office to ask for help from the Los Angeles Sheriff's major crimes bureau in locating him," said Daily Mirror.

Mila Kunis and Ashton Kutcher immediately amped up the security around them after they were informed of Dunn's escape.

The stakes are even higher now because nobody can predict how Dunn would react now that Mila Kunis has Ashton Kutcher in her life and daughter Wyatt, whom she gave birth in October last year.

The stalker was described as around 5'6" tall, with brown hair and blue eyes and weighed about 60 kilos.

According to Stuff magazine, Stuart Lynn Dunn faced two charges for stalking Mila Kunis.

"In February 2012, he pleaded no contest to a misdemeanour count of unauthorized entry of a dwelling after he broke into a house Kunis owned (but was not living in at the time)," it said. "The court ordered him to stay away from Kunis for three years."

But the court order failed to prevent Dunn from stalking Mila Kunis again as he was arrested outside the "Jupiter Ascending" star's gym just three months after the judge ordered him to stay away. Apparently, he was waiting outside for her for three consecutive days.

"Dunn pleaded no contest in January 2013 to a felony count of stalking Kunis, in proceedings that revealed he had repeatedly made calls seeking her personal information," the magazine said.

The facility has declined to provide more details on the circumstances on Mila Kunis' stalker's escape because of federal privacy policies but administrators assured that they are working closely with the police to bring Dunn back.