She even called you as a “superstar” on Twitter!

“I ran into @robkardashian today,” Nicole Richie tweeted on Dec. 21. “No joke, the funniest person on the planet. I was in tears & maybe even peed a little from laughing so hard. … He’s a superstar. Everyone follow him.” Nicole, even though you’re definitely entering TMI territory here, we have to agree with you! Rob Kardashian has us laughing every week on “Keeping up with the Kardashians.” We’d love to know what he said that got you giggling like a school girl!

“I mean you think me not seeing my Son is funny?! I Love him :)” Rob tweeted back. Since Rob doesn’t actually have any kids (that we know of!), we’re just going to assume that’s an inside joke between him and Nicole. The Kardashian and Richie families have been friends for a while now, so it’s not surprising to see two of their own goofing around — we just wish we were in on the joke, too!