Holly's bump watch!

Two days after confirming her pregnancy exclusively in the pages of Us Weekly, Hugh Hefner's former Girls Next Door girlfriend Holly Madison showed off her tiny baby bump in a vintage Disneyland tee while out and about in Las Vegas.

Pairing her comfy-casual look with green plaid pajama pants and Converse high-top sneakers, Madison ran errands in Sin City Thursday while hiding behind black sunglasses.

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Now 12 weeks along, Madison, 33, isn't dealing with morning sickness, but admits she battles bouts of nausea before she hits the stage in Las Vegas revue Peepshow. "I keep ginger ale backstage," the mom-to-be tells Us.

As she awaits the arrival of her first child, the former Playboy model isn't anticipating a pregnancy diet free-for-all. "I told [boyfriend Pasquale] no food-craving runs in the middle of the night! No chocolate cake!" Madison -- who split from Hefner, 86, in 2008 because he couldn't have kids -- explains. "I don't want to let myself go, then have a tough time getting back in shape."

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Intending to have "six kids" with party promoter Rotella, Madison -- who starred in Girls Next Door and her Holly's World spinoff on the E! network -- tells Us she is torn about having cameras in the delivery room, a la fellow E! mom Kourtney Kardashian.

"I don't know [if we'll film the birth]. But anyone in the delivery room will be banned from the waist down," Madison confirms. "Hello!"

This article originally appeared on Usmagazine.com: Holly Madison Debuts Tiny Baby Bump in Disneyland Tee