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Sorry, Bill Ackman, you are not the inspiration for “Billions” character Bobby Axelrod, despite your identical initials.

Ackman is the billionaire head of the Pershing Square hedge fund. Axelrod is the semicorrupt hedge funder played by Damian Lewis in the Showtime hit series.

At the CBS holiday party — also attended by “Billions” cast members Maggie Siff and David Costabile — at the network’s Black Rock headquarters in Midtown, I asked Lewis if Wall Streeters have embraced his character as they came to love Gordon Gekko (played by Michael Douglas) and quote Gekko’s signature line from “Wall Street”: “Greed is good!”

“Yes, they come up to me all the time,” the British actor said.

And some Wall Streeters are convinced Bobby Axelrod is based on Bill Ackman. “They say, ‘Ackman, Axelrod. They have the same initials.’ But Bobby Axelrod isn’t based on any real person,” Lewis said.

The show’s second season premieres Feb. 19.

Les Moonves — the chief of CBS Corp., the parent company of Showtime — was smiling over the 30 percent spike in CBS shares this year. He’s headed to Mexico for the holidays. “I need to rest,” he said.

Also filled with Yuletide cheer were “Bull” star Michael Weatherly, Stephen Colbert, Norah O’Donnell, Scott Pelley, Charlie Rose, Gayle King and Christine Baranski, star of “The Good Wife” spinoff “The Good Fight.”