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Actress Mila Kunis promotes “A Bad Moms Christmas” at CinemaCon in Las Vegas before flying home and picking her daughter up from pre-school. (March 30)
AP

Mila Kunis, Kristen Bell and Kathryn Hahn went to great lengths to be highly respectful while shooting a mall Santa scene for the sequel to Bad Moms. At least when there were children present.

“There was this one kid who was maybe 6, she still believed in Santa Claus — it was so sweet,” says Kunis. “We had to pretend Santa was real when she was on set. So we’d all refer to him as Santa, even the assistant director.”

But once those innocent initial scenes were in the can, the youngster was whisked away to allow the rowdy parents to let loose in a way the title A Bad Moms Christmas (in theaters Nov. 3) compels.

“Of course any children were ushered far away for when that Santa scene took a turn,” says Hahn. “We thought, ‘What can we do to wreak havoc in the Santa photo area of the mall? Let’s give him a lap dance.’ ”

This is now expected behavior for the stars of Bad Moms, whose drink-fueled, rowdy rebellion against the pressures of perfect motherhood was the R-rated breakout hit of 2016.  After the low-budget comedy shot to $113 million, writer/directors Jon Lucas and Scott Moore brought back the trio of mothers — Kiki (Bell), Amy (Kunis) and Carla (Hahn) — who are once again pushed to the point beyond caring.

Rather than dealing with the snooty moms who hounded them in the original, including Christina Applegate, this time the moms are fighting back against holiday stress and the expectation of making the season perfect for their families.

The…