Thats because McCarthy is starring in the ABC Family TV movie, Santa Baby, where she plays Santa Claus daughter who visits the North Pole.
During the film shoot, McCarthy took her four-year-old son, Evan, on the set to check out the reindeer and elves and teach him some basics about Christmas.
Says McCarthy: Evans only four, so, at this point, all he really knows is that Santa is a big, fat, happy dude that slides down chimneys and gives out presents.
McCarthy, who ends up dressing as Kris Kringle and taking over Christmas in the film, says Evan saw her in the red costume and understood that she was just pretending to be St. Nick.
She adds, He thought I was best friends with the real Santa and was really impressed with the VIP treatment we got at the North Pole.
McCarthy plans on watching Santa Baby with her son when it premieres December 10.
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