Rose Byrne Opens Up About Low-Key Celebrity Life & Working With Partner Bobby Cannavale: 'I Feel Really Lucky'

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It isn't just coincidence that Rose Byrne and Bobby Cannavale have worked together so much.

In a new interview with Instyle, the 37-year-old actress opens up about collaborating with her partner of five years, and how they've managed to co-star in three different films: 2014's Annie and Adult Beginners, and 2015's Spy.

WATCH: Bobby Cannavale Debuts Full Photo of Son Rocco to Celebrate His First Birthday: 'My Beautiful Boy'

"[It's] a little bit [intention and coincidence]. A happy coincidence in some ways, and also, 'Let’s really try to get these parts so we can be together and working,'" Byrne revealed. "We did, like, three projects in a row, and I enjoy collaborating with him."

The usually-private actress also opened up about what she loves most about her boyfriend, with whom she shares a 1-year-old son, Rocco.

"He is one of a kind, man! He’s endlessly interesting and entertaining," she gushed. "When something is special, it’s hard to articulate it, but I feel really lucky. We couldn’t be from more different parts of the world, you know?"

As for her low-key celebrity life, she said starting a family with Cannavale has made it increasingly more difficult.

WATCH: Rose Byrne Poses for 'Playboy' Just Months After Giving Birth

"The fascination with pregnant women [surprised me most about being a celebrity]," she shared. "After I had Rocco, the paparazzi came and sought me out. I never had that before. There’s a whole industry, literally, based on people having children. I guess because you’re changing, putting on weight. It makes me very uncomfortable. I didn’t enjoy that much at all."

But while Rocco has made avoiding the papparazzi more difficult, Byre said he's made it easier to forget about aging.

"I haven't thought about [turning 38]," she confessed. "The good thing about having a kid is you don’t think about that as much. Like when I turned 30, for instance, that was much more momentous. Forty is particularly great for a woman. It’s a big thing."

The Australian actress recently opened up to ET about returning to work after giving birth to film The Immortal Life of Henrietta Lacks with Oprah Winfrey. See what she said in the video below.