February 05, 2015 07:00 PM

Barry King/FilmMagic

Evan Ross and Ashlee Simpson have some exciting news.

“We’re having a girl!” Simpson, 30, tells PEOPLE exclusively.

The mom-to-be — who PEOPLE confirmed in December was pregnant with her second child — was anxious to find out the sex of their little one on the way. “I like to know — I want to do the nursery,” she says.

According to the singer and actress, they found out that they were expecting this past Thanksgiving, which she calls “a cute, fun day.”

The happy couple tied the knot in a bohemian-style ceremony in August, then took off for a sun-soaked honeymoon in Bali.

The baby girl will be Simpson’s first child with actor-musician Ross, 26. Simpson is already mom to son Bronx Mowgli, 6, with ex-husband Pete Wentz.

“I told him pretty early on,” Simpson says of breaking the news to her firstborn. “And he wanted to have a sister, so he’s really excited! He’s got a little brother. Now he’s going to have a little sister!”

Bronx is big brother to Saint Laszlo, Wentz’s 5-month-old son with longtime girlfriend Meagan Camper.

As for what the mom is looking forward to most? “I’m just excited for the new addition,” she says.

— Jeff Nelson

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