Helly Nahmad is a fixture at underground, star-studded poker games, sources allege.

His co-defendant in the federal case, “poker princess” Molly Bloom (pictured), 34, allegedly organized such games — first in New York, then in LA.

They take place in private homes and are by invitation only. Minimum bid is $50,000, and there’s often a million dollars on the table for a hand.

“Imagine a beautiful apartment,” one player said.

After a huge Russian opens the door, “you are greeted by two or three hot girls. They are masseuses.”

Food is served from a top restaurant. Alcohol is offered, but there isn’t a lot of drinking.

“It wasn’t like a friendly game of cards,” the player told The Post. “It was business.”

The house takes a flat fee from every player or a “rig,” a percentage of the pot.

To cash out, “you go to a back room with a girl behind a computer,” the player said. “She is the brains . . . She pays you right there on the spot.

“The security guard walks you back to the door, you hear the double lock behind you and you walk out around 7 a.m., and they are still going strong.”