Billionaire heiress DJ, Paris Hilton.SNL / Instagram

The 34-year-old socialite - who has never married or had children - has insisted that she is "happy" for her 34-year-old reality TV star friend, who she grew up with, despite Kim arguably eclipsing her in terms of fame, since starring on 'Keeping Up With The Kardashians', marrying Kanye West and giving birth to North.

Paris told the Sunday Times newspaper: "Kim and I have been friends since we were little girls. I'm so happy for her. She has a beautiful family. She's doing incredibly well. I'm so incredibly proud of her. We're both killing it."

The 'Simple Life' star has previously said she believes the two of them share the same work ethic and that's why they've both been successful. They used to party together a lot and are still friends, and Paris recognizes many of the traits she has in her pal.

She recently said: "Kim Kardashian always had a great work ethic like me. I'm very determined in life. Being successful really fulfills me. I work hard. I'm a good person with a good heart. That's why I've been in this business for so long, and that's why my product lines do so well."