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Teresa Giudice doesn't think her daughters -- Gia, 9, Gabriella, 6, Milania, 5 and Audriana, 11 months -- are too young to wear makeup.

"They see their mommy doing it and they want to do whatever mommy does," the Real Housewives of New Jersey star, 38, tells

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When people question their age, she shrugs them off: "It's just lip gloss."

Audriana is growing so fast, Giudice tells Us.

"She's laughing, she's such a happy baby! She takes after her mom and dad because I think we're both real easy goin,'" she says. "She's clapping, she's starting to wave, she's sitting up."

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Giudice -- who recently filed for bankruptcy after acquiring $11 million in debt when husband Joe's real estate deals went sour -- is working on another diet book. But that's not all she's penning.

"I have to write everything in her book. I always keep up with [her milestones] and I always have a camera. I'm like a creep with picture because once they get big, all you have is pictures and memories," she says.

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One thing she doesn't want to hold on to, though: her baby weight.

"I haven't lost it all yet!" she says. "I still have about 10 pounds to go."

For 15 pages of Hollywood moms' must-have accessories, parenting tips and exclusive photos, pick up the new issue of Us Weekly, on stands now.