Rob Kardashian showed off his softer, emotional side when crying on national TV during Sunday's Keeping Up With the Kardashians -- bursting into tears thanks to his second eldest sister, Kim Kardashian.
"Kim brings out my negative energy," Rob, 25, admitted to Ryan Seacrest during a Tuesday interview after the family's group therapy session -- also including their siblings Kourtney and Khloe Kardashian and mom Kris Jenner -- aired on E!. Storming off after an angry spat in which he accused her of interfering with his career, Rob says he didn't intend to cry on camera.
"I didn't even expect the therapist to get emotions out of me. I didn't want to cry in front of my whole family. Kourtney gets emotional when she sees me cry," Rob admits, adding that things will get equally as explosive on next Sunday's part-two of the therapy episode. "I'm not trying to make anyone feel bad, but I just had to get out of there. It was needed. I'm a Pisces -- emotional."
What is it about 31-year-old Kim that gets under Rob's skin? For one, her hypervigilance when it comes to spending. "When it comes to money and business, Kim thinks I tend to spend too much, and I'm really stupid with my money. She takes those things personally. I just get very passionate about things and I usually take it out on Kim always," he told Seacrest. "She's an easy target -- I know how to push her buttons. But obviously we say those things and we love each other the next day."
On the eve of his family's big episode, Kardashian blew off steam with the aid of his pal Rihanna. "It was just me and a bunch of girls," Kardashian explains of the Saturday night outing -- celebrating a mutual friend's birthday -- to Racer's Edge Indoor Karting in Burbank, Calif. and the Playhouse nightclub in Hollywood. "It was a good night. It was fun."