"Married life is so normal and fun and not much different," she tells Harper's Bazaar magazine for its April cover story, adding: "We felt married for so long".
It's not surprising that the Cake star, 47, finds her union so much fun - she cites Justin, 44, as the funniest person she's ever met.
"I'm lucky because Justin is the funniest person I've met, and we make each other laugh," she confesses. "Laughter is one of the great keys to staying youthful."
Jennifer's feelings echo those recently expressed by the Zoolander 2 actor.
"It’s a laugh a minute," he told Loaded magazine last month. "When we get on a run, it's pretty fun. There's been a couple of times when she has brought me to my knees laughing and me her."
"Literally, there was one time and she did something so funny and I was literally on my knees. So yeah, it's a fun house," he added.
Fans of Jennifer and Justin were excited when the actor joined Instagram three months ago, hoping that they would get a glimpse into the actor's private life. But it seems that his more than 195,000 followers will have to keep waiting, as privacy is very important for both of them.
"We work so hard to maintain some sort of life and privacy," she tells Harper's Bazaar. "Why would we intentionally put ourselves out there?"
In December, the actor shared the first image of his wife on Instagram. The handsome 44-year-old uploaded a snapshot taken from behind of his social media-shy wife, wearing a strapless red gown and posing with her hands on her hips. "#wcw," Justin captioned the picture, proudly declaring Jennifer his 'Woman Crush Wednesday', "#valentinored #xo."
Weeks later, he shared another snapshot which showed the couple dressed in skiing gear. "Happy Holidays & Merry Christmas!," he wrote alongside it.