Click to email this to a friend (Opens in new window)

“Smallville” actress Allison Mack has been arrested for her alleged role in the notorious upstate sex slave cult Nxivm, federal prosecutors announced Friday.

She is expected to appear Friday in Brooklyn federal court on charges of sex trafficking and forced labor.

The bust comes less than a month after Nxivm leader Keith Raniere was collared on the same charges at a luxury villa in Mexico — where they had been hiding out since one of their “slaves” in October went public with her experience in the cult.

Mack, 35, was Raniere’s direct “slave” and had a sexual relationship with him — but also acted as a “master” to other slaves, who were forced to have sex with Raniere and get his initials burned into their pubic region with a cauterizing pen, according to the criminal complaint.

As the women were being branded like cattle, Mack allegedly placed her hands on their chests and told them to “feel the pain” and to “think of [their] master,” prosecutors say.

The actress first lured the women into the secret society within Nxivm known as “The Vow” — and cajoled them into providing “collateral” like embarrassing photos and statements to use as blackmail, federal prosecutors allege.

She then allegedly groomed the slaves for sex with Raniere — ordering them to adhere to extremely restrictive diets, refrain from removing their pubic hair, and to stay celibate, according to court documents.

She also forced them to pose naked for photos — “including on one occasion close-up pictures of their vaginas” — which were given to Raniere and also used as collateral, the feds charge.

Mack and other slave “masters” allegedly made their slaves participate in “readiness” drills, requiring them to respond to requests at any time of the day or night so they were “seriously sleep-deprived.”

One of her slaves became so thin and tired that she stopped getting periods.

Mack, who played Chloe Sullivan on the hit superhero show, was recruited to Nxivm by fellow “Smallville” star Kristin Kreuk in 2006 and rose up the ranks into Raniere’s inner circle — while Kreuk ultimately left, the group’s former publicist previously told The Post.

Mack was last seen chasing after Raniere in Mexico as cops hauled him away.

Both face at least 15 years behind bars and a maximum sentence of life imprisonment.