November 20, 2012 10:00 AM

Scott Gries/Invision for The Hub/AP

Now the mom of three boys, Melissa Joan Hart once found herself dreaming of a life with daughters.

The inspiration behind her fleeting fantasy? Tackling the terrible twos — and a coloring book! — with eldest son Mason Walter.

“[He] just would not calm down, he was such a wild man,” the Melissa & Joey star, 36, told PEOPLE during The Hub‘s Playdate Premiere Party sponsored by The MOMS on Nov. 10 in New York City, where a new Guinness World Record was set for the largest coloring book ever.

“And I would keep saying, ‘Why can’t I have a little girl that just sits and colors?'”

But despite taking his time to show his true talents, the now 6½-year-old not only works wonders with a crayon, but has moved on to creating his own picture books.

“He steals our printer paper and he makes up books about different animals,” the proud mama shares. “He has a collection of books he’s made under his bed.”

And with Hart currently in the process of writing her own memoir, her son’s sketching skills could one day be quite useful to the author. “He may very well end up doing the illustrations for my book,” she jokes.

The actress recently welcomed her third son Tucker McFadden — Hart and her husband Mark Wilkerson are also parents to Braydon Hart, 4, pictured above — and would love nothing more than to expand her family further … if it weren’t for the pesky pregnancy process.

“I would have seven babies if I didn’t have to be pregnant. I hate being pregnant — the lack of energy at the beginning [and] having to change your diet,” she says. “It’s a huge adjustment and you have to change your whole lifestyle for a few months.”

But with such a bright light at the end of the tunnel — her baby boy! — Hart knows the best days are yet to come.

“What gets me through the rough months [is that] I remember that it is going to get better as his personality changes,” she explains. “Soon he is going to be crawling and walking.”

Mason and Brady also have been making the transition easier on Mom by offering a helping hand — and a turn at diaper duty! — when needed.

“The older boys help with diaper changes. I am like, ‘Can you grab Mommy that?’ and after weeks [of that] they are like, ‘Gosh, you can never do anything for yourself,'” Hart says with a laugh.

— Anya Leon with reporting by Debra Lewis-Boothman

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