51952126 Celebrities attend the launch of Jennifer Lopez's residency 'JENNIFER LOPEZ: ALL I HAVE' at Planet Hollywood Resort & Casino on January 20, 2016 in Las Vegas, Nevada. Celebrities attend the launch of Jennifer Lopez's residency 'JENNIFER LOPEZ: ALL I HAVE' at Planet Hollywood Resort & Casino on January 20, 2016 in Las Vegas, Nevada. Pictured: Holly Madison FameFlynet, Inc - Beverly Hills, CA, USA - +1 (310) 505-9876

51952126 Celebrities attend the launch of Jennifer Lopez's residency 'JENNIFER LOPEZ: ALL I HAVE' at Planet Hollywood Resort & Casino on January 20, 2016 in Las Vegas, Nevada. Celebrities attend the launch of Jennifer Lopez's residency 'JENNIFER LOPEZ: ALL I HAVE' at Planet Hollywood Resort & Casino on January 20, 2016 in Las Vegas, Nevada. Pictured: Holly Madison FameFlynet, Inc - Beverly Hills, CA, USA - +1 (310) 505-9876

Congratulations to Holly Madison and Pasquale Rotella.

The Girls Next Door alum, 36, and her husband are expecting their second child in August, PEOPLE reports.

The former Playboy model – who is three months along – and her husband are already parents to 2½-year-old daughter Rainbow.

“I’m so excited,” Madison tells the mag. “This time I know what to expect a little bit more. [That] makes it even more enjoyable!”

While the gender is unknown, “I’m kind of feeling the boy vibe,” the expectant mama shares. “We’ll see how psychic I am!”

And it sounds like Rainbow is ready for big sisterhood.

“She was the first person my husband and I told,” says Madison. “She’s rooting for a girl. I think she’s going to be a good big sister. She’s very caring and she loves playing with her baby dolls and taking care of the pets.”

As for pregnancy weight gain, the model mom isn’t worried too much.

“I gained a healthy amount last time,” she says. “And I lost it pretty easily. I’m not really putting the pressure on myself. Worst case scenario, I’ll just get lipo!”

Will it be another unique baby name this time around?

“I don’t really like normal names,” she explains. “We have a few finalists. I got so much heat for the baby name, I want to wait to share!”

The expectant mama debuted her barely there baby bump at the launch of Jennifer Lopez‘s Las Vegas concert residency at the Planet Hollywood Hotel & Casino on Wednesday (January 20).