Rob Kardashian & Mama June — Only One Has Lost 100 lbs.

0307_rob_june_PCN_RameyReality stars Rob Kardashian and Honey Boo Boo”s Mama June have guts … to be so public with their weight battles.

Rob — who has been working out hard trying to lose the 40 lbs. he gained since his breakup with Rita Ora — showed off his manly curves in a clingy white t-shirt at the Clippers game in L.A. last night , while Mama June proudly showed off her slimmer physique on Wednesday … after dropping 100 lbs. from not dieting and not hitting the gym.

Rob better redneckognize that sketti may be the new protein shake.