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Rob Kardashian is feeling motivated. 

With just a few weeks until fiancée Blac Chyna's due date, the dad-to-be is making a public commitment to shed his "pregnancy weight."

"Oh yeah we snapping back," he wrote on Instagram with a photo split of him looking trim with Chyna in a bikini. "Baby will be here in 4 weeks and I'm done with carrying this pregnancy weight me and my baby gonna be righttttttt ,,, MOTIVATION TIME we almost there Chy."

The reality star took a beat to compliment his partner. "FAAAAACK Chy looks so bomb here aghhhh," he wrote. 

Rob Kardashian, Blac Chyna, Gym, Diet, Fitness

Instagram

Soon after they first went public with their relationship in late January, the 28-year-old Lashed owner further encouraged her beau at the gym in light of his diabetes diagnosis.

A source told E! News at the time that Rob has been "taking better care of himself since his health scare," and Chyna is helping him continue along that path.

Chyna often photographed Kardashian working out and started him on her own fitness boot camp for five weeks, featuring sprints on the treadmill and runs near their house. 

While he has since announced he's clear of his diabetes, it seems the youngest Kardashian still has his eye on the scale. 

With the clock counting down to their first daughter's arrival, Kardashian sounds more motivated than ever to get back into his best shape—and many are on his side. 

"You both can get back there! Just stay motivated," one fan commented on Instagram. "It's hard, but you can do it together."