If you ever cross paths with Julianne Moore, don't call her "ma'am!"

On Monday's Chelsea Lately, the 53-year-old Non-Stop star explained why she can't stand the polite, formal term. "It's terrible," she said. "You may as well say, like, ‘Hey, old lady, do you need some help getting up the steps?' Or, ‘Can I cut your food for you, old lady?'"

Clearly, Moore isn't one of those moms who will teach her son Caleb and daughter Liv to say, "Yes, ma'am," and "no, ma''am," but she does like when they call her "mommy" as opposed to just "mom."

Her daughter Liv, she explained, "loves to go to spas," but, "because she's 11, she can't get into any of the fancy ones. You have to be older, like a teenager." Chelsea Handler asked the reasoning behind a lot of spas' no kids policy, to which Moore replied, "I don't know—[maybe] so you don't disturb the ma'ams!"

But Moore doesn't mind hitting up Spa Castle, a national spa franchise that allows kids. "They're enormous," she explained. "Floors and floors of hot tubs and steam rooms."

The actress and her daughter hit up the female only steam room, where "everyone's naked, so [Liv] got to see all these different types of bodies."

"She said, 'Mom, I didn't know that there are big boobs, and little boobs and round boobs and pointy boobs and all kinds of boobs,'" Moore said laughingly. "And then there was this lady—I thought she was wearing underpants [nods her head no]—and I was like, 'Yeah, there's that, too.'"

Tune into Chelsea Lately weeknights at 11 p.m. on E!

PHOTOS: Julianne Moore, Fashion Spotlight!

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