Kylie Jenner Honors ‘Best Friend’ Rob Kardashian In Latest Instagram Post Amid Weight Gain Woes; Throwback Photo Shows Much Leaner Sock Mogul

Kylie Jenner have been mired in controversy this 2015 because of her selfies showing her full lips, but Tyga's rumored girlfriend posted a sweet message on Instagram on April 21 paying tribute to Rob Kardashian, who has become a recluse following his weight gain.

The "KUWTK" star shared a photo of a much leaner Rob Kardsahian on her Instagram which she captioned, "My best friend, my heart, my brother."

One fan noted of Rob Kardashian, "Probably the only normal sane one in the family."

Another said, "This is honestly so cute and thoughtful."

Kylie Jenner's Instagram post came out of nowhere and without context that it's hard to say if Tyga's rumored girlfriend missed Rob Kardashian, who continues to struggle with his weight gain this 2015, or she was just staying away from the #KylieJennerLipChallenge controversy.

The challenge quickly became trending on Twitter with young girls sucking on shot glasses in an effort to emulate Kylie Jenner's full lips, which ended up in tragedy. Some of the girls shared photos of their discolored and swelling lips as a result of sucking on the shot glass for a long time.

The last time Tyga's rumored girlfriend Kylie Jenner posted something about her brother was on Rob Kardashian's birthday on March 17.

In an Instagram post, the "KUWTK" star shared a photo of her sitting on the lap of Rob Kardashian. Tyga's rumored girlfriend wrote, "This was almost a decade ago but I still want to sit on ur lap like ur little sister I still am ️ MY LOVE FOR U IS ENDLESS!!!!!! Happy birthday Robby."

Rob Kardashian is reportedly hiding in Khloe Kardashian's mansion in Calabasas while he struggles with his weight gain. In a recent report, the sock mogul was allegedly planning to sue his family this 2015 to stop them from discussing his weight problems as part of the storyline for "KUWTK."