Ashlee Simpson: Being Pregnant Again Feels 'New to Me'

Evan Ross may soon be the novice parent of a newborn, but Ashlee Simpson wouldn’t quite call herself an expert: She thinks she’ll need to brush up on her baby skills, too.

“I think that no matter what, with every child it’s different,” the mom-to-be, who’s expecting a daughter, told PEOPLE at Monday’s screening of Ross’s new film, Just Before I Go.

“It feels new to me too, and it’s been six years, so I’m like, ‘Here we go! We gotta learn how to get the swaddle on again!’ ”

But the future first-time father — who Simpson says is “already amazing” — isn’t letting his nerves get the best of him. “A lot of times, nervousness is actually just being excited and I can’t wait,” he shares.

“It is the most special thing that I could ever think of, and I’m really excited.”

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Equally ecstatic about the baby girl’s upcoming arrival is 6-year-old big brother Bronx Mowgli, Simpson’s son with ex-husband Pete Wentz.

“He’s so excited! He has a little brother already, so he’s excited that he’s having a little sister now,” Simpson, 30, says, referring to Wentz’s 8-month-old son with girlfriend Meagan Camper.

“He actually said, ‘She’ll be so adorable! She’ll want to do tea parties!’ ”

Adds Ross, 26, “And he was like, ‘I’m not sure that I’ll do them, but maybe I’ll do them once in a while … ‘ ”

Simpson is “feeling really great” and staying in shape throughout her pregnancy with the help of Tracy Anderson‘s prenatal workouts. The exercises, she jokes, have even become a tag-team effort as Ross has started with his own training sessions.

“What is funny is that I’ve been bringing all of my boys to do it now! I swear to God, they do a different workout and it’s brilliant,” says Ross.

And although the mom-to-be admits she’s “sitting [while] he does the hard stuff,” Ross gives his pregnant wife plenty of props.

“What she does is actually amazing, and when I get to watch her do it, it’s the cutest thing in the world,” he says of her workouts.

— Anya Leon with reporting by Reagan Alexander