From Serena Williams to Olivia Munn, Kim Kardashian has a pretty diverse set of famous friends. At a private beauty event, the reality star revealed her favorite beauty secrets with another well-known friend of her's, Madonna.

Madonna And Kim Kardashian's Friendship 

The "Like A Virgin" singer and the beauty mogul have known each other for quite some time, which is a little odd considering their age difference, but the two quickly clarified how they met.

"She, at a time period in her life, moved in with her manager, who happened to be our next-door neighbor growing up. So, Kourtney [Kardashian] and I would walk... and we would see Madonna," Kardashian stated at the event.

Kardashian continued that the pop singer gave her and her sister black bracelets that she didn't want to wear. The Keeping Up with The Kardashians star also revealed that she was present at the filming of the singer's music video for the song, "Cherish." 

The conversation then focused on the two ladies' beauty brands and advice they would like to give.

"I love giving advice. People always come to me, I love analyzing someone's face and going with them to a doctor and [being] like, 'Wait, a little botox here and little here," Kardashian replied.

"I feel like I if I spray water, I'll have more energy, also stay out of the sun," Madonna chimed in. 

Kardashian is the owner of KKW Beauty and Madonna is the owner of MDNA SKIN. 

Eating paper with KIm....,.,,,,, A foreshadowing of things to come #beauty #skincare #workinggirls #oscar #fun #mdnaskin #thermalwaters #holywater @jr @kimkardashian @mdnaskin ♥️ A post shared byMadonna (@madonna) on Mar 5, 2018 at 10:58pm PST

The private event was hosted by Kandee Johnson at Los Angeles' YouTube Space on Tuesday, March. 6.

And we make cute ! Thank you @kimkardashian and all the folks @mdnaskin A post shared by Madonna(@madonna) on Mar 6, 2018 at 11:17pm PST

Kardashian, who is married to hip-hop artist and producer Kanye West, recently welcomed her third child, Chicago West, via surrogate on Jan. 15, 2018. The reality star is also mom to North and Saint.