Actress Rose Byrne is the mother of two sons with her boyfriend, Bobby Cannavale, and she couldn’t be more thankful for their little family. In a new interview, with People, the Australian star candidly confessed “being a mother changes everything.”

Rose got sentimental about the bond she shares with her two kids, especially after starring in the new movie Instant Family, which is in theaters now. “You’re always thinking about it — and then everything else,” Rose gushed. “It informs everything you do.” The 39-year-old shares sons Rocco, 2, and Rafa, 1, with Bobby, and the four of them are just too cute together! But parenting, especially with two young kiddos, isn’t always smooth-sailing, she warned.

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In Instant Family, Rose plays a woman who adopts three kids with her husband, who is played by Mark Walhberg. Even though she was cast to play Ellie, the blonde beauty says she was drawn to the movie in general from the very start. “I had just had my second kid and was in a bit of a fog and very emotional,” Rose admitted. ” Bobby and I read the script, and by the end we were in floods of tears. The film gets you in with the laughs, but then punches you in the gut.”

Since playing Ellie, Rose said she’s been able to compare her movie scenarios to her real-life situations. She even opened up about what surprised her the most about becoming a mom. “Every day, every hour, I’m like ‘What is happening?'” the star admitted. Luckily for Rose, she doesn’t let her head get underwater and knows when to ask for help. “What’s great is there is such a community — you can ask your mom, your neighbor, or a friend,” she said.

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Before being cast in the film, Rose admitted that she wasn’t too familiar with how adoption works. But after playing the role of a mother who adopts children, she has a much clearer perception. “I don’t know where to begin in terms of what I learned. I learned everything. I was really naive about the foster care system,” she told Entertainment Weekly. “To have seen the inspirational side of this, in terms of what can be achieved and what can be done, and to be part of the movie — it’s about trying to bring joy to these kids and lose the stigma of being a foster kid.”