"They can't wait to be parents," gushes the source, adding that Stone, 32, is "about six or seven months" along and feels great. "She and Dave have been in total nesting mode, setting up the nursery and ordering things for the baby online."
And they're doing it all without any outside help. McCary, 35, "likes to handle things himself, [so] he's been putting the crib together and baby proofing their house in L.A.," the source continues.
"They're really enjoying this special time in their lives." And while the source admits that being pregnant during the pandemic hasn't been easy for the actress, she's trying not to stress over it.
"She's taking good care of herself, eating right and doing her prenatal exercises," shares the source. "Mostly, Emma stays close to home, cooks and watches movies with Dave. She also enjoys walks around her neighborhood because getting outdoors in the fresh air does wonders too."
The Oscar winner plans to continue her laid-back lifestyle after the little one arrives. "She's looking forward to taking some time off from filming," says the source. "Emma's worked pretty steadily in the last decade and feels she owes it to her child to be there. Plus, she wants to soak up every moment."
In December, the Easy A alum was spotted showing off her growing stomach. "She was glowing and cradling her bump a lot," an eyewitness said at the time.
In the photos, Stone wore a stretchy black shirt with black leggings and shoes, as she walked around with a pal.
It's no surprise the red-headed beauty is expanding her brood, since she previously spoke about her desire to become a mama.
"My perspective about kids has changed as I've gotten older," she told Elle in 2018. "I never babysat or anything. As a teenager, I was like, I'm never getting married, I'm never having kids. And then I got older and I was like, I really want to get married, I really want to have kids."