Lewis revealed that he had bonded with Kim's children
"My niece and nephew always gave me a lot of happiness," he said. "My girlfriend's kids, I love spending time with them."
"She's got four, so I'm getting to play with these kids," Lewis added, before revealing that he even gifted them a furry friend. "I got them a dog this year, so little Halo is a new member of that family."
Inside Lewis Hamilton and Kim Kardashian's budding romance
Lewis and Kim had slowly been sharing their romance with the world, after going Instagram official in April. They have since gone on vacation together with her children, whom she shares with her ex-husband, Kanye West.
"Let's just say that every single box on my manifest list was checked," Kim said on The Kardashians, referring to her relationship with the British star.
Learn more about Lewis and Kim's budding romance below...
WATCH: Lewis Hamilton and Kim Kardashian share sweet PDA moment
"Isn't that crazy? Every single one. 55. To just look up one day and be like, 'Wait, let me check the manifest list,' and be like, 'Yes! Yes! Yes!' It's a crazy feeling."
Prior to dating Lewis, Kim was linked to NFL player Odell Beckham Jr. and comedian Pete Davidson, but primarily focused on herself and her kids after divorcing Kanye in 2021.
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"I was really single for five years," Kim told The Times. "That felt great. I could focus on my kids and projects that I really wanted to be involved with. I really felt no rush."
"I felt like I needed my time," she continued. "I wanted to completely heal and just work on myself. I wasn't ready to open up. I really wasn't even thinking about it…The universe works in your favor when you just allow it to."
Meanwhile, Lewis dated singer Nicole Scherzinger from 2007 to 2015, and appeared to remain single until going public with Kim. The 41-year-old got candid about why he chose to be solo for so long in an interview with RTBF.
''I look at the other [F1] drivers and I wonder how they're doing it. Some are having kids, some married, most of them have girlfriends," he said.
Lewis chose to focus on his career after splitting from Nicole Scherzinger
''I did that when I was in my 20s. But I took a decision to really maximize my time that I have here because it's not as long as you think and it's limited. I don't want to look back and be like, 'If I just gave a little bit more here, I didn't sacrifice my time because I was committed elsewhere.'"
Lewis added that when he retired, he planned to "do whatever I want" and focus more on his personal life. ''I can dedicate my time to whatever else it is and not have to worry. But in this competition time, focus on health, wellbeing, my mental health, my driving technique, being as good an engineer as I can be, and also being the best teammate I can potentially be," he declared.