Rob Kardashian attends the Sky Beach Club at the Tropicana Las Vegas May 28, 2016 . Credit: Gabe Ginsberg/Getty Images

He's got big shoes to fill. Rob Kardashian shared a sweet throwback pic with his late father, Robert Kardashian, on Thursday, September 1.

"Can't wait," the reality TV star captioned the photo, referring to his impending fatherhood, and adding, "MISS YOU POPS."

The only son of the O.J. Simpson lawyer — who died of esophageal cancer in 2003 — is expecting his first child with Blac Chyna later this year, and has already shown that he's ready to be a dad as he helps his fiancée look after her 3-year-old son, King Cairo, whom she shares with ex Tyga.

Can't wait ‼️ MISS YOU POPS

A photo posted by ROBERT KARDASHIAN (@robkardashian) on

In a new trailer for the couple's E! reality series, Rob & Chyna, the sock entrepreneur can be seen putting his hand lovingly on Chyna's belly as they discuss their impending arrival, but it's not all hearts and flowers between the pair, who got engaged in April, just four months after they revealed they were dating.

The ups and downs of their fledging relationship play out on their new reality show as Chyna, 28, accuses the 29-year-old of "texting other females" in the trailer, which was released Thursday, September 1.

Kardashian ends up in tears after he tries to apologize to his fiancée, and he turns to his family for advice. "Everybody argues in a new relationship," his mom, Kris Jenner, tells her only son.

Chyna talked about her man in an interview in the new issue of Elle, which features her showcasing her baby bump in a topless photo shoot.

"When I linked up with Rob, he was at a point where nobody could really help him," she told the magazine of their romance, which began as a friendship. "But I'm the type of person that likes to motivate my friends and help them figure out how they can do better. That's how we really started off."

"Around Rob, I'm always able to speak my mind and speak freely and not care," she added. "I can do the craziest stuff or say the craziest stuff, and he doesn't judge me."

Rob & Chyna premieres on E! Sunday, September 11, at 9 p.m. ET.

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