Tough love, or just plain mean?
The reality stars are caught discussing the weighty subject on camera and the scene is due to air Sunday on Keeping Up With the Kardashians—and OKMagazine.com has a clip.
The two sit munching on salads as they rip Rob over his new bod and stretch marks, and despite their "concerned tone" both Kim, 32, and Khloe, 28, seem unable to keep the smirks off heir faces.
"So I was getting a massage last night, and the girl told me if you scratch yourself that's how you get stretch marks because your skin gets really itchy,"
Kim says. "And Rob has them. Maybe for the fact that he flakes on me all the time."
They then go on to discuss possible ways of forcing Rob to slim down.
"Reverse psychology," Khloe suggests. "We need to psyche him out. I know someone who was trying to get their mom to quit smoking so they put her in a phone booth with a packet of cigarettes and said 'here you go…. go for it…smoke to your heart's content.
"They got so sick they stopped smoking…. so, maybe let Rob binge out a little."
"If we put him in a room and just give him burgers and fries and pizza," Kim quips.
"We get I'm so sick he'll be like, 'I can never eat fast food again," Khloe chimes in.
"At this point," Kim says, "I'm willing to try anything."
As previously reported, Rob announced at his birthday party on March 15 that his goal is to lose 40 pounds by July 4! Rob has even recruited friends like his Dancing With the Stars partner Cheryl Burke to help him workout!
Keeping Up With the Kardashians airs Sunday, June 9, at 9 p.m. EST on E!
Do you think Kim and Khloe were being caring sisters or just plain mean girls? Sound off in comments below and tweet us @OKMagazine