By Breaking Celebrity News Staff

Everyone's been talking about Rob Kardashian's teary breakdown on this week's episode of Keeping Up with the Kardashians, but it turns out the reality hunk has reason to be crying tears of joy, as he opened up about his date with pop princess Rihanna Saturday.

"I was just trying to go at my own pace, didn't really do much," the Dancing with the Stars alum told Ryan Seacrest Tuesday on his KIIS FM breakfast show of the date, which consisted of Go-karting and then clubbing.

He said they have a mutual pal "and it was her birthday. Then we all went out to celebrate our friend’s birthday. It was fun! It was a good night!”

As for the meltdown on Sunday's episode, Rob jokingly attributed the emotional outburst to his horoscope sign (he's a Pisces).

"I just get very passionate about things," he said, adding "the therapist just got the emotions all out of me. I just had to get out of there. I guess it was something that needed to be let out.