A man charged with stalking actress Mila Kunis has been placed on $150,000 bail after pleading not guilty to the crime.

Stuart Lynn Dunn was arrested in Los Angeles earlier this month after following the Black Swan beauty to her gym three days in a row.

Kunis contacted cops on the third day after Dunn allegedly confronted her in the parking lot as she left the building, and he was subsequently charged with two counts of felony stalking.

He appeared in court on Friday and protested his innocence, but the judge expressed concerns about Dunn's behaviour and set bail at the unusually high figure of $150,000.

The judge also issued a new protective order against Dunn as part of his bail terms, banning him from going anywhere near Kunis.

The 27-year-old suspect had previously been ordered to stay away from Kunis for three years after breaking into her vacant home in January and inhabiting the property.

His next court date has been set for May 31.