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Rob Kardashian, Khloe Kardashian Odom

Dimitrios Kambouris/Getty Images for E!

Khloe Kardashian is keeping it real on Twitter.

The 31-year-old posted a throwback photo of her and her brother Rob Kardashian and wrote the following short (yet emotional) message:

"It's simple…I miss you." She added three emoji crying faces to really drive her point home next to the black-and-white snapshot of her brother giving her a kiss on the cheek.

Meanwhile, Kourtney Kardashian replied to her younger sister's tweet by writing, "True love."

The timing of Khloe's post comes on the heels of Rob being seen stepping out in Los Angeles with his new lady love, Blac Chyna.

The new couple were seen hugging while running errands and Blac even posted a few pictures of her kissing her boyfriend's cheek.

Back in December, Khloe shared the exact same image and posted a touching note for her younger brother.

"If only you could see yourself through my eyes!" she said on her Instagram account. "I'll forever be obsessed with you! My one and only! #MyAce"

But it seems that the siblings have hit a slightly rocky patch since Rob began dating Blac earlier this year.

In late January, a source told E! News that Rob's "sisters are livid about their relationship and not supportive of it at all."

"All the sisters are united and think Rob is being disloyal," a second source close to the family revealed to E! News. "They want him to be happy, but they're just so over the whole thing."

Watch the season finale of Keeping Up With the Kardashians Sunday night at 9 p.m. only on E!