Amid the weight loss troubles of Rob Kardashian and his alleged falling out with momager Kris Jenner and big sis, Kim, Khloe Kardashian has always been there for the sock mogul.

Just recently, Khloe Kardashian posted a throwback photo of a much leaner Rob Kardashian kissing him on the temple as she stares into the camera for the selfie.

James Harden's girlfriend wrote, "If only you could see yourself through my eyes! I'll forever be obsessed with you! My one and only! #MyAce."

The post generated a lot of positive comments for Khloe Kardashian who stood by Rob Kardashian amid his weight loss troubles.

One fan wrote, "She's the only one who seems to care about him."

Another said, "Rob instead of being all bummed out, find motivation just like Khloe did. She's now the hottest thing alive!!! You can do this, just put some effort!!! Love you."

"He's your only brother, they are so special love him and appreciate him always...." one of her followers told Khloe Kardashian.

"I love my brother too, so much it's hard being the only boy in a family, ESP with girly girls, I feel for him! You have such a good heart," one fan complimented James Harden's girlfriend.

Another commented, "I miss you Rob. Whatever is going on. It'll get better I promise. I love you so much! And thank goodness you have Khloe. Such a good heart xoxo."

When Rob Kardashian was having problems with his weight loss, as he reportedly ballooned to over 300 pounds, he dropped out of the limelight and shacked with Khloe Kardashian. That time, all the rumors pointed to the alleged feud between the sock mogul and Kris Jenner and Kim Kardashian who were supposedly pressuring him into dropping the weight.

Lately, however, multiple reports claimed that Rob Kardashian is serious about his weight loss regimen and already dropped some 15 kilos through the help of a personal trainer and nutritionist.