May 24, 2016 08:25 AM

Holly Madison has only a few months to go in her pregnancy – and she’s not letting it slow her down.

Madison signed copies of her new book The Vegas Diaries at The Grove Barnes & Noble in Los Angeles Monday, showing off her growing baby bump. The star’s second child, a son, is due in August.

The 36-year-old, who also shares 3-year-old daughter Rainbow with her husband, Pasquale Rotella, smiled in a form-fitting maroon dress, which featured ruching around her baby belly.

Vincent Sandoval/Getty

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In The Vegas Diaries, Madison’s second memoir about her time in the Playboy Mansion, the star describes being a “shy violet” – something she recently told PEOPLE she doesn’t want for her children.

“I want Rainbow to learn to be verbal and stand up for herself. If I could go back, I’d be a lot more outspoken,” she told PEOPLE. “I wouldn’t have allowed myself to be made to feel less than.”

WATCH: Holly Madison Reveals She’s Expecting…a Boy!

Despite her tumultuous history as the one-time girlfriend of Hugh Hefner, Madison told PEOPLE Now, “I would love for my daughter to learn from me.”

And being a mother of two? Madison is cautiously optimistic. “Some people will tell me that once you have your second baby, it’s just as easy as one,” she explained. “Then a friend texted me after I announced my pregnancy [to say], ‘Watch out, two is like three!’ and I’m like, ‘No, don’t tell me that!’ “

— Lindsay Kimble

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