Emma Watson and Kelly Clarkson May Have Been Targeted by 'Smallville' Actress Allison Mack for Alleged Sex Cult

Mack turned herself in to authorities last week, and has been charged with recruiting sex slaves for NXIVM.

Did actress Allison Mack try to recruit celebrities such as Emma Watson and Kelly Clarkson to an alleged sex cult?

Mack, who appeared in "Smallville," was arrested Friday for allegedly recruiting woman as sex "slaves" to service the leader of a group  to which she belonged, according to prosecutors. The group, called NXIVM (Nexium), is based in Albany, N.Y. 

The 35-year-old pleaded not guilty in Brooklyn federal court to charges of sex trafficking and forced labor. Alleged cult leader Keith Raniere faces similar charges and has also pleaded not guilty.

In a statement Friday, U.S. Attorney Richard P. Donoghue said that Mack recruited women for Raniere, and that the women were “exploited, both sexually and for their labor."

Mack may have tried to entice "Harry Potter" actress Watson, and "The Voice" judge Clarkson, according to some recently unearthed tweets.

The Twitter messages were sent by Mack in 2016 to Watson.

"I'm a fellow actress like yourself & involved in an amazing women's movement I think you'd dig," Mack wrote. "I'd love to chat if you're open."

Another note on Twitter, posted to Watson that some year said, "I participate in a unique human development & women's movement I'd love to tell you about."

Three years earlier, Mack sent Clarkson a post that read, "I heard through the grapevine that you're a fan of "Smallville." I'm a fan of yours as well! I'd love to chat sometime."

It's unclear whether either star responded to Mack's queries. 

Mack was released from federal custody on $5 million bail.