Allison Mack allegedly starved ‘Dynasty’ star Catherine Oxenberg’s daughter India

The daughter of “Dynasty” actress Catherine Oxenberg spent a year on a 500-calorie-a-day diet while in Nxivm’s secret sex cult, a former slave testified Friday.

Ex-member “Nicole” testified that “Smallville” actress and alleged slave master Allison Mack was so manipulative, she’d threaten to starve Oxenberger’s daughter India even further to ensure that Nicole remained obedient.

”When India and I became close, they would use her to make me behave,” Nicole explained during the sex-trafficking trial of accused Nxivm leader Keith Raniere.

“Alison was trying to have [Oxenberg] get down to a certain weight, and they decided that goal weight was 107 pounds,” Nicole said.

Previous witnesses have described how Raniere preferred his “slaves” skinny, sleep-deprived and compliant.

“It was just really hard to watch, sometimes,” Nicole sobbed as she recalled seeing Oxenberg struggle with her forced diet. “It was tough on her.”

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Nicole, whose last name is being withheld, continues on the stand in Brooklyn Federal Court on Monday.